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Checkasm: assembly testing and benchmarking tool

Browse Source 
It provides the following features:
 * verify correctness by comparing output to the C version.
 * detect failure to save and restore clobbered callee-saved registers.
 * detect 32-bit parameters being used as if they were 64-bit in x86-64
   (the upper halves are not guaranteed to be zero - but in practice
   they very often are, which makes those bugs hard to spot otherwise).
 * easy benchmarking.

Compile by running 'make checkasm'.
Execute by running 'tests/checkasm/checkasm'.

Optional arguments are '--bench' to run benchmarks for all functions,
'--bench=<pattern>' to run benchmarks for all functions that starts with
<pattern>, and '<integer>' to seed the PRNG for reproducible results.

Contains unit tests for most h264pred functions to get started, more tests
can be added afterwards using those as a reference.

Loosely based on code from x264. Currently only supports x86 and x86-64,
but additional architectures shouldn't be too much of an obstacle to add.

Note that functions with floating point parameters or floating point
return values are not supported. Some compiler-specific features or
preprocessor hacks would likely be required to add support for that.

Signed-off-by: Janne Grunau <janne-libav@jannau.net>
pull/140/head
Henrik Gramner 10 years ago committed by Janne Grunau
parent 796268654c
commit 8bc67ec2c0
8 changed files with 1086 additions and 0 deletions
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  1. 1
      .gitignore
  2. 2
      tests/Makefile
  3. 33
      tests/checkasm/Makefile
  4. 484
      tests/checkasm/checkasm.c
  5. 115
      tests/checkasm/checkasm.h
  6. 252
      tests/checkasm/h264pred.c
  7. 6
      tests/checkasm/x86/Makefile
  8. 193
      tests/checkasm/x86/checkasm.asm

1
.gitignore vendored
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@ -46,6 +46,7 @@
/libavutil/avconfig.h
/tests/audiogen
/tests/base64
/tests/checkasm/checkasm
/tests/data/
/tests/pixfmts.mak
/tests/rotozoom

2
tests/Makefile
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@ -173,5 +173,7 @@ testclean:
-include $(wildcard tests/*.d)
include $(SRC_PATH)/tests/checkasm/Makefile
.PHONY: fate* lcov lcov-reset
.INTERMEDIATE: coverage.info

33
tests/checkasm/Makefile
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# libavcodec tests
AVCODECOBJS-$(CONFIG_H264PRED) += h264pred.o
CHECKASMOBJS-$(CONFIG_AVCODEC) += $(AVCODECOBJS-yes)
-include $(SRC_PATH)/tests/checkasm/$(ARCH)/Makefile
CHECKASMOBJS += $(CHECKASMOBJS-yes) checkasm.o
CHECKASMOBJS := $(sort $(CHECKASMOBJS:%=tests/checkasm/%))
-include $(CHECKASMOBJS:.o=.d)
CHECKASMDIRS := $(sort $(dir $(CHECKASMOBJS)))
$(CHECKASMOBJS): | $(CHECKASMDIRS)
OBJDIRS += $(CHECKASMDIRS)
# We rely on function pointers intentionally declared without specified argument types.
tests/checkasm/%.o: CFLAGS := $(CFLAGS:-Wstrict-prototypes=-Wno-strict-prototypes)
CHECKASM := tests/checkasm/checkasm$(EXESUF)
$(CHECKASM): $(EXEOBJS) $(CHECKASMOBJS) $(FF_DEP_LIBS)
$(LD) $(LDFLAGS) $(LDEXEFLAGS) $(LD_O) $(CHECKASMOBJS) $(FF_EXTRALIBS)
checkasm: $(CHECKASM)
clean:: checkasmclean
checkasmclean:
$(RM) $(CHECKASM) $(CLEANSUFFIXES:%=tests/checkasm/%) $(CLEANSUFFIXES:%=tests/checkasm/$(ARCH)/%)
.PHONY: checkasm

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tests/checkasm/checkasm.c
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/*
* Assembly testing and benchmarking tool
* Copyright (c) 2015 Henrik Gramner
* Copyright (c) 2008 Loren Merritt
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with Libav; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "checkasm.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/random_seed.h"
#if ARCH_X86
#include "libavutil/x86/cpu.h"
#endif
#if HAVE_SETCONSOLETEXTATTRIBUTE
#include <windows.h>
#define COLOR_RED FOREGROUND_RED
#define COLOR_GREEN FOREGROUND_GREEN
#define COLOR_YELLOW (FOREGROUND_RED|FOREGROUND_GREEN)
#else
#define COLOR_RED 1
#define COLOR_GREEN 2
#define COLOR_YELLOW 3
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if !HAVE_ISATTY
#define isatty(fd) 1
#endif
/* List of tests to invoke */
static void (* const tests[])(void) = {
#if CONFIG_H264PRED
checkasm_check_h264pred,
#endif
NULL
};
/* List of cpu flags to check */
static const struct {
const char *name;
const char *suffix;
int flag;
} cpus[] = {
#if ARCH_X86
{ "MMX", "mmx", AV_CPU_FLAG_MMX|AV_CPU_FLAG_CMOV },
{ "MMXEXT", "mmxext", AV_CPU_FLAG_MMXEXT },
{ "3DNOW", "3dnow", AV_CPU_FLAG_3DNOW },
{ "3DNOWEXT", "3dnowext", AV_CPU_FLAG_3DNOWEXT },
{ "SSE", "sse", AV_CPU_FLAG_SSE },
{ "SSE2", "sse2", AV_CPU_FLAG_SSE2|AV_CPU_FLAG_SSE2SLOW },
{ "SSE3", "sse3", AV_CPU_FLAG_SSE3|AV_CPU_FLAG_SSE3SLOW },
{ "SSSE3", "ssse3", AV_CPU_FLAG_SSSE3|AV_CPU_FLAG_ATOM },
{ "SSE4.1", "sse4", AV_CPU_FLAG_SSE4 },
{ "SSE4.2", "sse42", AV_CPU_FLAG_SSE42 },
{ "AVX", "avx", AV_CPU_FLAG_AVX },
{ "XOP", "xop", AV_CPU_FLAG_XOP },
{ "FMA3", "fma3", AV_CPU_FLAG_FMA3 },
{ "FMA4", "fma4", AV_CPU_FLAG_FMA4 },
{ "AVX2", "avx2", AV_CPU_FLAG_AVX2 },
#endif
{ NULL }
};
typedef struct CheckasmFuncVersion {
struct CheckasmFuncVersion *next;
intptr_t (*func)();
int ok;
int cpu;
int iterations;
uint64_t cycles;
} CheckasmFuncVersion;
/* Binary search tree node */
typedef struct CheckasmFunc {
struct CheckasmFunc *child[2];
CheckasmFuncVersion versions;
char name[1];
} CheckasmFunc;
/* Internal state */
static struct {
CheckasmFunc *funcs;
CheckasmFunc *current_func;
CheckasmFuncVersion *current_func_ver;
const char *bench_pattern;
int bench_pattern_len;
int num_checked;
int num_failed;
int nop_time;
int cpu_flag;
const char *cpu_flag_name;
} state;
/* PRNG state */
AVLFG checkasm_lfg;
/* Print colored text to stderr if the terminal supports it */
static void color_printf(int color, const char *fmt, ...)
{
static int use_color = -1;
va_list arg;
#if HAVE_SETCONSOLETEXTATTRIBUTE
static HANDLE con;
static WORD org_attributes;
if (use_color < 0) {
CONSOLE_SCREEN_BUFFER_INFO con_info;
con = GetStdHandle(STD_ERROR_HANDLE);
if (con && con != INVALID_HANDLE_VALUE && GetConsoleScreenBufferInfo(con, &con_info)) {
org_attributes = con_info.wAttributes;
use_color = 1;
} else
use_color = 0;
}
if (use_color)
SetConsoleTextAttribute(con, (org_attributes & 0xfff0) | (color & 0x0f));
#else
if (use_color < 0) {
const char *term = getenv("TERM");
use_color = term && strcmp(term, "dumb") && isatty(2);
}
if (use_color)
fprintf(stderr, "\x1b[%d;3%dm", (color & 0x08) >> 3, color & 0x07);
#endif
va_start(arg, fmt);
vfprintf(stderr, fmt, arg);
va_end(arg);
if (use_color) {
#if HAVE_SETCONSOLETEXTATTRIBUTE
SetConsoleTextAttribute(con, org_attributes);
#else
fprintf(stderr, "\x1b[0m");
#endif
}
}
/* Deallocate a tree */
static void destroy_func_tree(CheckasmFunc *f)
{
if (f) {
CheckasmFuncVersion *v = f->versions.next;
while (v) {
CheckasmFuncVersion *next = v->next;
free(v);
v = next;
}
destroy_func_tree(f->child[0]);
destroy_func_tree(f->child[1]);
free(f);
}
}
/* Allocate a zero-initialized block, clean up and exit on failure */
static void *checkasm_malloc(size_t size)
{
void *ptr = calloc(1, size);
if (!ptr) {
fprintf(stderr, "checkasm: malloc failed\n");
destroy_func_tree(state.funcs);
exit(1);
}
return ptr;
}
/* Get the suffix of the specified cpu flag */
static const char *cpu_suffix(int cpu)
{
int i = FF_ARRAY_ELEMS(cpus);
while (--i >= 0)
if (cpu & cpus[i].flag)
return cpus[i].suffix;
return "c";
}
#ifdef AV_READ_TIME
static int cmp_nop(const void *a, const void *b)
{
return *(const uint16_t*)a - *(const uint16_t*)b;
}
/* Measure the overhead of the timing code (in decicycles) */
static int measure_nop_time(void)
{
uint16_t nops[10000];
int i, nop_sum = 0;
for (i = 0; i < 10000; i++) {
uint64_t t = AV_READ_TIME();
nops[i] = AV_READ_TIME() - t;
}
qsort(nops, 10000, sizeof(uint16_t), cmp_nop);
for (i = 2500; i < 7500; i++)
nop_sum += nops[i];
return nop_sum / 500;
}
/* Print benchmark results */
static void print_benchs(CheckasmFunc *f)
{
if (f) {
print_benchs(f->child[0]);
/* Only print functions with at least one assembly version */
if (f->versions.cpu || f->versions.next) {
CheckasmFuncVersion *v = &f->versions;
do {
if (v->iterations) {
int decicycles = (10*v->cycles/v->iterations - state.nop_time) / 4;
printf("%s_%s: %d.%d\n", f->name, cpu_suffix(v->cpu), decicycles/10, decicycles%10);
}
} while ((v = v->next));
}
print_benchs(f->child[1]);
}
}
#endif
/* ASCIIbetical sort except preserving natural order for numbers */
static int cmp_func_names(const char *a, const char *b)
{
int ascii_diff, digit_diff;
for (; !(ascii_diff = *a - *b) && *a; a++, b++);
for (; av_isdigit(*a) && av_isdigit(*b); a++, b++);
return (digit_diff = av_isdigit(*a) - av_isdigit(*b)) ? digit_diff : ascii_diff;
}
/* Get a node with the specified name, creating it if it doesn't exist */
static CheckasmFunc *get_func(const char *name, int length)
{
CheckasmFunc *f, **f_ptr = &state.funcs;
/* Search the tree for a matching node */
while ((f = *f_ptr)) {
int cmp = cmp_func_names(name, f->name);
if (!cmp)
return f;
f_ptr = &f->child[(cmp > 0)];
}
/* Allocate and insert a new node into the tree */
f = *f_ptr = checkasm_malloc(sizeof(CheckasmFunc) + length);
memcpy(f->name, name, length+1);
return f;
}
/* Perform tests and benchmarks for the specified cpu flag if supported by the host */
static void check_cpu_flag(const char *name, int flag)
{
int old_cpu_flag = state.cpu_flag;
flag |= old_cpu_flag;
av_set_cpu_flags_mask(flag);
state.cpu_flag = av_get_cpu_flags();
if (!flag || state.cpu_flag != old_cpu_flag) {
int i;
state.cpu_flag_name = name;
for (i = 0; tests[i]; i++)
tests[i]();
}
}
/* Print the name of the current CPU flag, but only do it once */
static void print_cpu_name(void)
{
if (state.cpu_flag_name) {
color_printf(COLOR_YELLOW, "%s:\n", state.cpu_flag_name);
state.cpu_flag_name = NULL;
}
}
int main(int argc, char *argv[])
{
int i, seed, ret = 0;
if (!tests[0] || !cpus[0].flag) {
fprintf(stderr, "checkasm: no tests to perform\n");
return 1;
}
if (argc > 1 && !strncmp(argv[1], "--bench", 7)) {
#ifndef AV_READ_TIME
fprintf(stderr, "checkasm: --bench is not supported on your system\n");
return 1;
#endif
if (argv[1][7] == '=') {
state.bench_pattern = argv[1] + 8;
state.bench_pattern_len = strlen(state.bench_pattern);
} else
state.bench_pattern = "";
argc--;
argv++;
}
seed = (argc > 1) ? atoi(argv[1]) : av_get_random_seed();
fprintf(stderr, "checkasm: using random seed %u\n", seed);
av_lfg_init(&checkasm_lfg, seed);
check_cpu_flag(NULL, 0);
for (i = 0; cpus[i].flag; i++)
check_cpu_flag(cpus[i].name, cpus[i].flag);
if (state.num_failed) {
fprintf(stderr, "checkasm: %d of %d tests have failed\n", state.num_failed, state.num_checked);
ret = 1;
} else {
fprintf(stderr, "checkasm: all %d tests passed\n", state.num_checked);
#ifdef AV_READ_TIME
if (state.bench_pattern) {
state.nop_time = measure_nop_time();
printf("nop: %d.%d\n", state.nop_time/10, state.nop_time%10);
print_benchs(state.funcs);
}
#endif
}
destroy_func_tree(state.funcs);
return ret;
}
/* Decide whether or not the specified function needs to be tested and
* allocate/initialize data structures if needed. Returns a pointer to a
* reference function if the function should be tested, otherwise NULL */
intptr_t (*checkasm_check_func(intptr_t (*func)(), const char *name, ...))()
{
char name_buf[256];
intptr_t (*ref)() = func;
CheckasmFuncVersion *v;
int name_length;
va_list arg;
va_start(arg, name);
name_length = vsnprintf(name_buf, sizeof(name_buf), name, arg);
va_end(arg);
if (!func || name_length <= 0 || name_length >= sizeof(name_buf))
return NULL;
state.current_func = get_func(name_buf, name_length);
v = &state.current_func->versions;
if (v->func) {
CheckasmFuncVersion *prev;
do {
/* Only test functions that haven't already been tested */
if (v->func == func)
return NULL;
if (v->ok)
ref = v->func;
prev = v;
} while ((v = v->next));
v = prev->next = checkasm_malloc(sizeof(CheckasmFuncVersion));
}
v->func = func;
v->ok = 1;
v->cpu = state.cpu_flag;
state.current_func_ver = v;
if (state.cpu_flag)
state.num_checked++;
return ref;
}
/* Decide whether or not the current function needs to be benchmarked */
int checkasm_bench_func(void)
{
return !state.num_failed && state.bench_pattern &&
!strncmp(state.current_func->name, state.bench_pattern, state.bench_pattern_len);
}
/* Indicate that the current test has failed */
void checkasm_fail_func(const char *msg, ...)
{
if (state.current_func_ver->cpu && state.current_func_ver->ok) {
va_list arg;
print_cpu_name();
fprintf(stderr, " %s_%s (", state.current_func->name, cpu_suffix(state.current_func_ver->cpu));
va_start(arg, msg);
vfprintf(stderr, msg, arg);
va_end(arg);
fprintf(stderr, ")\n");
state.current_func_ver->ok = 0;
state.num_failed++;
}
}
/* Update benchmark results of the current function */
void checkasm_update_bench(int iterations, uint64_t cycles)
{
state.current_func_ver->iterations += iterations;
state.current_func_ver->cycles += cycles;
}
/* Print the outcome of all tests performed since the last time this function was called */
void checkasm_report(const char *name, ...)
{
static int prev_checked, prev_failed, max_length;
if (state.num_checked > prev_checked) {
print_cpu_name();
if (*name) {
int pad_length = max_length;
va_list arg;
fprintf(stderr, " - ");
va_start(arg, name);
pad_length -= vfprintf(stderr, name, arg);
va_end(arg);
fprintf(stderr, "%*c", FFMAX(pad_length, 0) + 2, '[');
} else
fprintf(stderr, " - %-*s [", max_length, state.current_func->name);
if (state.num_failed == prev_failed)
color_printf(COLOR_GREEN, "OK");
else
color_printf(COLOR_RED, "FAILED");
fprintf(stderr, "]\n");
prev_checked = state.num_checked;
prev_failed = state.num_failed;
} else if (!state.cpu_flag) {
int length;
/* Calculate the amount of padding required to make the output vertically aligned */
if (*name) {
va_list arg;
va_start(arg, name);
length = vsnprintf(NULL, 0, name, arg);
va_end(arg);
} else
length = strlen(state.current_func->name);
if (length > max_length)
max_length = length;
}
}

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/*
* Assembly testing and benchmarking tool
* Copyright (c) 2015 Henrik Gramner
* Copyright (c) 2008 Loren Merritt
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with Libav; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef CHECKASM_H
#define CHECKASM_H
#include <stdint.h>
#include "config.h"
#include "libavutil/avstring.h"
#include "libavutil/lfg.h"
#include "libavutil/timer.h"
void checkasm_check_h264pred(void);
intptr_t (*checkasm_check_func(intptr_t (*func)(), const char *name, ...))() av_printf_format(2, 3);
int checkasm_bench_func(void);
void checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
void checkasm_update_bench(int iterations, uint64_t cycles);
void checkasm_report(const char *name, ...) av_printf_format(1, 2);
extern AVLFG checkasm_lfg;
#define rnd() av_lfg_get(&checkasm_lfg)
static av_unused intptr_t (*func_ref)();
static av_unused intptr_t (*func_new)();
#define BENCH_RUNS 1000 /* Trade-off between accuracy and speed */
/* Decide whether or not the specified function needs to be tested */
#define check_func(func, ...) ((func_new = (intptr_t (*)())func) &&\
(func_ref = checkasm_check_func(func_new, __VA_ARGS__)))
/* Indicate that the current test has failed */
#define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
/* Print the test outcome */
#define report(...) checkasm_report("" __VA_ARGS__)
/* Call the reference function */
#define call_ref(...) func_ref(__VA_ARGS__)
#if ARCH_X86 && HAVE_YASM
/* Verifies that clobbered callee-saved registers are properly saved and restored */
intptr_t checkasm_checked_call(intptr_t (*func)(), ...);
#endif
/* Call the function */
#if ARCH_X86_64 && HAVE_YASM
/* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
* This is done by clobbering the stack with junk around the stack pointer and calling the
* assembly function through x264_checkasm_call with added dummy arguments which forces all
* real arguments to be passed on the stack and not in registers. For 32-bit arguments the
* upper half of the 64-bit register locations on the stack will now contain junk which will
* cause misbehaving functions to either produce incorrect output or segfault. Note that
* even though this works extremely well in practice, it's technically not guaranteed
* and false negatives is theoretically possible, but there can never be any false positives.
*/
void checkasm_stack_clobber(uint64_t clobber, ...);
#define CLOB (UINT64_C(0xdeadbeefdeadbeef))
#define call_new(...) (checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
checkasm_checked_call(func_new, 0, 0, 0, 0, 0, __VA_ARGS__))
#elif ARCH_X86_32 && HAVE_YASM
#define call_new(...) checkasm_checked_call(func_new, __VA_ARGS__)
#else
#define call_new(...) func_new(__VA_ARGS__)
#endif
/* Benchmark the function */
#ifdef AV_READ_TIME
#define bench_new(...)\
do {\
if (checkasm_bench_func()) {\
intptr_t (*tfunc)() = func_new;\
uint64_t tsum = 0;\
int ti, tcount = 0;\
for (ti = 0; ti < BENCH_RUNS; ti++) {\
uint64_t t = AV_READ_TIME();\
tfunc(__VA_ARGS__);\
tfunc(__VA_ARGS__);\
tfunc(__VA_ARGS__);\
tfunc(__VA_ARGS__);\
t = AV_READ_TIME() - t;\
if (t*tcount <= tsum*4 && ti > 0) {\
tsum += t;\
tcount++;\
}\
}\
checkasm_update_bench(tcount, tsum);\
}\
} while (0)
#else
#define bench_new(...)
#endif
#endif

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/*
* Copyright (c) 2015 Henrik Gramner
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with Libav; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <string.h>
#include "checkasm.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/h264pred.h"
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
static const int codec_ids[4] = { AV_CODEC_ID_H264, AV_CODEC_ID_VP8, AV_CODEC_ID_RV40, AV_CODEC_ID_SVQ3 };
static const char * const pred4x4_modes[4][15] = {
{ /* H264 */
[VERT_PRED ] = "vertical",
[HOR_PRED ] = "horizontal",
[DC_PRED ] = "dc",
[DIAG_DOWN_LEFT_PRED ] = "down_left",
[DIAG_DOWN_RIGHT_PRED] = "down_right",
[VERT_RIGHT_PRED ] = "vertical_right",
[HOR_DOWN_PRED ] = "horizontal_right",
[VERT_LEFT_PRED ] = "vertical_left",
[HOR_UP_PRED ] = "horizontal_up",
[LEFT_DC_PRED ] = "left_dc",
[TOP_DC_PRED ] = "top_dc",
[DC_128_PRED ] = "dc_128",
},
{ /* VP8 */
[VERT_PRED ] = "vertical_vp8",
[HOR_PRED ] = "horizontal_vp8",
[VERT_LEFT_PRED] = "vertical_left_vp8",
[TM_VP8_PRED ] = "tm_vp8",
[DC_127_PRED ] = "dc_127_vp8",
[DC_129_PRED ] = "dc_129_vp8",
},
{ /* RV40 */
[DIAG_DOWN_LEFT_PRED ] = "down_left_rv40",
[VERT_LEFT_PRED ] = "vertical_left_rv40",
[HOR_UP_PRED ] = "horizontal_up_rv40",
[DIAG_DOWN_LEFT_PRED_RV40_NODOWN] = "down_left_nodown_rv40",
[HOR_UP_PRED_RV40_NODOWN ] = "horizontal_up_nodown_rv40",
[VERT_LEFT_PRED_RV40_NODOWN ] = "vertical_left_nodown_rv40",
},
{ /* SVQ3 */
[DIAG_DOWN_LEFT_PRED] = "down_left_svq3",
},
};
static const char * const pred8x8_modes[4][11] = {
{ /* H264 */
[DC_PRED8x8 ] = "dc",
[HOR_PRED8x8 ] = "horizontal",
[VERT_PRED8x8 ] = "vertical",
[PLANE_PRED8x8 ] = "plane",
[LEFT_DC_PRED8x8 ] = "left_dc",
[TOP_DC_PRED8x8 ] = "top_dc",
[DC_128_PRED8x8 ] = "dc_128",
[ALZHEIMER_DC_L0T_PRED8x8] = "mad_cow_dc_l0t",
[ALZHEIMER_DC_0LT_PRED8x8] = "mad_cow_dc_0lt",
[ALZHEIMER_DC_L00_PRED8x8] = "mad_cow_dc_l00",
[ALZHEIMER_DC_0L0_PRED8x8] = "mad_cow_dc_0l0",
},
{ /* VP8 */
[PLANE_PRED8x8 ] = "tm_vp8",
[DC_127_PRED8x8] = "dc_127_vp8",
[DC_129_PRED8x8] = "dc_129_vp8",
},
{ /* RV40 */
[DC_PRED8x8 ] = "dc_rv40",
[LEFT_DC_PRED8x8] = "left_dc_rv40",
[TOP_DC_PRED8x8 ] = "top_dc_rv40",
},
{ /* SVQ3 */
},
};
static const char * const pred16x16_modes[4][9] = {
{ /* H264 */
[DC_PRED8x8 ] = "dc",
[HOR_PRED8x8 ] = "horizontal",
[VERT_PRED8x8 ] = "vertical",
[PLANE_PRED8x8 ] = "plane",
[LEFT_DC_PRED8x8] = "left_dc",
[TOP_DC_PRED8x8 ] = "top_dc",
[DC_128_PRED8x8 ] = "dc_128",
},
{ /* VP8 */
[PLANE_PRED8x8 ] = "tm_vp8",
[DC_127_PRED8x8] = "dc_127_vp8",
[DC_129_PRED8x8] = "dc_129_vp8",
},
{ /* RV40 */
[PLANE_PRED8x8] = "plane_rv40",
},
{ /* SVQ3 */
[PLANE_PRED8x8] = "plane_svq3",
},
};
static const uint32_t pixel_mask[3] = { 0xffffffff, 0x01ff01ff, 0x03ff03ff };
#define SIZEOF_PIXEL ((bit_depth + 7) / 8)
#define BUF_SIZE (3*16*17)
#define check_pred_func(func, name, mode_name)\
(mode_name && ((codec_ids[codec] == AV_CODEC_ID_H264) ?\
check_func(func, "pred%s_%s_%d", name, mode_name, bit_depth) :\
check_func(func, "pred%s_%s", name, mode_name)))
#define randomize_buffers()\
do {\
uint32_t mask = pixel_mask[bit_depth-8];\
int i;\
for (i = 0; i < BUF_SIZE; i += 4) {\
uint32_t r = rnd() & mask;\
AV_WN32A(buf0+i, r);\
AV_WN32A(buf1+i, r);\
}\
} while (0)
#define src0 (buf0 + 4*16) /* Offset to allow room for top and left */
#define src1 (buf1 + 4*16)
static void check_pred4x4(H264PredContext *h, uint8_t *buf0, uint8_t *buf1,
int codec, int chroma_format, int bit_depth)
{
if (chroma_format == 1) {
uint8_t *topright = buf0 + 2*16;
int pred_mode;
for (pred_mode = 0; pred_mode < 15; pred_mode++) {
if (check_pred_func(h->pred4x4[pred_mode], "4x4", pred4x4_modes[codec][pred_mode])) {
randomize_buffers();
call_ref(src0, topright, (ptrdiff_t)12*SIZEOF_PIXEL);
call_new(src1, topright, (ptrdiff_t)12*SIZEOF_PIXEL);
if (memcmp(buf0, buf1, BUF_SIZE))
fail();
bench_new(src1, topright, (ptrdiff_t)12*SIZEOF_PIXEL);
}
}
}
}
static void check_pred8x8(H264PredContext *h, uint8_t *buf0, uint8_t *buf1,
int codec, int chroma_format, int bit_depth)
{
int pred_mode;
for (pred_mode = 0; pred_mode < 11; pred_mode++) {
if (check_pred_func(h->pred8x8[pred_mode], (chroma_format == 2) ? "8x16" : "8x8",
pred8x8_modes[codec][pred_mode])) {
randomize_buffers();
call_ref(src0, (ptrdiff_t)24*SIZEOF_PIXEL);
call_new(src1, (ptrdiff_t)24*SIZEOF_PIXEL);
if (memcmp(buf0, buf1, BUF_SIZE))
fail();
bench_new(src1, (ptrdiff_t)24*SIZEOF_PIXEL);
}
}
}
static void check_pred16x16(H264PredContext *h, uint8_t *buf0, uint8_t *buf1,
int codec, int chroma_format, int bit_depth)
{
if (chroma_format == 1) {
int pred_mode;
for (pred_mode = 0; pred_mode < 9; pred_mode++) {
if (check_pred_func(h->pred16x16[pred_mode], "16x16", pred16x16_modes[codec][pred_mode])) {
randomize_buffers();
call_ref(src0, (ptrdiff_t)48);
call_new(src1, (ptrdiff_t)48);
if (memcmp(buf0, buf1, BUF_SIZE))
fail();
bench_new(src1, (ptrdiff_t)48);
}
}
}
}
static void check_pred8x8l(H264PredContext *h, uint8_t *buf0, uint8_t *buf1,
int codec, int chroma_format, int bit_depth)
{
if (chroma_format == 1 && codec_ids[codec] == AV_CODEC_ID_H264) {
int pred_mode;
for (pred_mode = 0; pred_mode < 12; pred_mode++) {
if (check_pred_func(h->pred8x8l[pred_mode], "8x8l", pred4x4_modes[codec][pred_mode])) {
int neighbors;
for (neighbors = 0; neighbors <= 0xc000; neighbors += 0x4000) {
int has_topleft = neighbors & 0x8000;
int has_topright = neighbors & 0x4000;
if ((pred_mode == DIAG_DOWN_RIGHT_PRED || pred_mode == VERT_RIGHT_PRED) && !has_topleft)
continue; /* Those aren't allowed according to the spec */
randomize_buffers();
call_ref(src0, has_topleft, has_topright, (ptrdiff_t)24*SIZEOF_PIXEL);
call_new(src1, has_topleft, has_topright, (ptrdiff_t)24*SIZEOF_PIXEL);
if (memcmp(buf0, buf1, BUF_SIZE))
fail();
bench_new(src1, has_topleft, has_topright, (ptrdiff_t)24*SIZEOF_PIXEL);
}
}
}
}
}
/* TODO: Add tests for H.264 lossless H/V prediction */
void checkasm_check_h264pred(void)
{
static const struct {
void (*func)(H264PredContext*, uint8_t*, uint8_t*, int, int, int);
const char *name;
} tests[] = {
{ check_pred4x4, "pred4x4" },
{ check_pred8x8, "pred8x8" },
{ check_pred16x16, "pred16x16" },
{ check_pred8x8l, "pred8x8l" },
};
DECLARE_ALIGNED(16, uint8_t, buf0)[BUF_SIZE];
DECLARE_ALIGNED(16, uint8_t, buf1)[BUF_SIZE];
H264PredContext h;
int test, codec, chroma_format, bit_depth;
for (test = 0; test < FF_ARRAY_ELEMS(tests); test++) {
for (codec = 0; codec < 4; codec++) {
int codec_id = codec_ids[codec];
for (bit_depth = 8; bit_depth <= (codec_id == AV_CODEC_ID_H264 ? 10 : 8); bit_depth++)
for (chroma_format = 1; chroma_format <= (codec_id == AV_CODEC_ID_H264 ? 2 : 1); chroma_format++) {
ff_h264_pred_init(&h, codec_id, bit_depth, chroma_format);
tests[test].func(&h, buf0, buf1, codec, chroma_format, bit_depth);
}
}
report("%s", tests[test].name);
}
}

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tests/checkasm/x86/Makefile
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CHECKASMOBJS-$(HAVE_YASM) += x86/checkasm.o
tests/checkasm/x86/%.o: tests/checkasm/x86/%.asm
$(DEPYASM) $(YASMFLAGS) -I $(<D)/ -M -o $@ $< > $(@:.o=.d)
$(YASM) $(YASMFLAGS) -I $(<D)/ -o $@ $<
-$(STRIP) $(STRIPFLAGS) $@

193
tests/checkasm/x86/checkasm.asm
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;*****************************************************************************
;* Assembly testing and benchmarking tool
;* Copyright (c) 2008 Loren Merritt
;* Copyright (c) 2012 Henrik Gramner
;*
;* This file is part of Libav.
;*
;* Libav is free software; you can redistribute it and/or modify
;* it under the terms of the GNU General Public License as published by
;* the Free Software Foundation; either version 2 of the License, or
;* (at your option) any later version.
;*
;* Libav is distributed in the hope that it will be useful,
;* but WITHOUT ANY WARRANTY; without even the implied warranty of
;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;* GNU General Public License for more details.
;*
;* You should have received a copy of the GNU General Public License
;* along with this program; if not, write to the Free Software
;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
;*****************************************************************************
%define private_prefix checkasm
%include "libavutil/x86/x86inc.asm"
SECTION_RODATA
error_message: db "failed to preserve register", 0
%if ARCH_X86_64
; just random numbers to reduce the chance of incidental match
ALIGN 16
x6: dq 0x1a1b2550a612b48c,0x79445c159ce79064
x7: dq 0x2eed899d5a28ddcd,0x86b2536fcd8cf636
x8: dq 0xb0856806085e7943,0x3f2bf84fc0fcca4e
x9: dq 0xacbd382dcf5b8de2,0xd229e1f5b281303f
x10: dq 0x71aeaff20b095fd9,0xab63e2e11fa38ed9
x11: dq 0x89b0c0765892729a,0x77d410d5c42c882d
x12: dq 0xc45ea11a955d8dd5,0x24b3c1d2a024048b
x13: dq 0x2e8ec680de14b47c,0xdd7b8919edd42786
x14: dq 0x135ce6888fa02cbf,0x11e53e2b2ac655ef
x15: dq 0x011ff554472a7a10,0x6de8f4c914c334d5
n7: dq 0x21f86d66c8ca00ce
n8: dq 0x75b6ba21077c48ad
n9: dq 0xed56bb2dcb3c7736
n10: dq 0x8bda43d3fd1a7e06
n11: dq 0xb64a9c9e5d318408
n12: dq 0xdf9a54b303f1d3a3
n13: dq 0x4a75479abd64e097
n14: dq 0x249214109d5d1c88
%endif
SECTION .text
cextern fail_func
; max number of args used by any asm function.
; (max_args % 4) must equal 3 for stack alignment
%define max_args 15
%if ARCH_X86_64
;-----------------------------------------------------------------------------
; int checkasm_stack_clobber(uint64_t clobber, ...)
;-----------------------------------------------------------------------------
cglobal stack_clobber, 1,2
; Clobber the stack with junk below the stack pointer
%define size (max_args+6)*8
SUB rsp, size
mov r1, size-8
.loop:
mov [rsp+r1], r0
sub r1, 8
jge .loop
ADD rsp, size
RET
%if WIN64
%assign free_regs 7
%else
%assign free_regs 9
%endif
;-----------------------------------------------------------------------------
; intptr_t checkasm_checked_call(intptr_t (*func)(), ...)
;-----------------------------------------------------------------------------
INIT_XMM
cglobal checked_call, 2,15,16,max_args*8+8
mov r6, r0
; All arguments have been pushed on the stack instead of registers in order to
; test for incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
mov r0, r6mp
mov r1, r7mp
mov r2, r8mp
mov r3, r9mp
%if UNIX64
mov r4, r10mp
mov r5, r11mp
%assign i 6
%rep max_args-6
mov r9, [rsp+stack_offset+(i+1)*8]
mov [rsp+(i-6)*8], r9
%assign i i+1
%endrep
%else
%assign i 4
%rep max_args-4
mov r9, [rsp+stack_offset+(i+7)*8]
mov [rsp+i*8], r9
%assign i i+1
%endrep
%endif
%if WIN64
%assign i 6
%rep 16-6
mova m %+ i, [x %+ i]
%assign i i+1
%endrep
%endif
%assign i 14
%rep 15-free_regs
mov r %+ i, [n %+ i]
%assign i i-1
%endrep
call r6
%assign i 14
%rep 15-free_regs
xor r %+ i, [n %+ i]
or r14, r %+ i
%assign i i-1
%endrep
%if WIN64
%assign i 6
%rep 16-6
pxor m %+ i, [x %+ i]
por m6, m %+ i
%assign i i+1
%endrep
packsswb m6, m6
movq r5, m6
or r14, r5
%endif
jz .ok
mov r9, rax
lea r0, [error_message]
call fail_func
mov rax, r9
.ok:
RET
%else
; just random numbers to reduce the chance of incidental match
%define n3 dword 0x6549315c
%define n4 dword 0xe02f3e23
%define n5 dword 0xb78d0d1d
%define n6 dword 0x33627ba7
;-----------------------------------------------------------------------------
; intptr_t checkasm_checked_call(intptr_t (*func)(), ...)
;-----------------------------------------------------------------------------
cglobal checked_call, 1,7
mov r3, n3
mov r4, n4
mov r5, n5
mov r6, n6
%rep max_args
PUSH dword [esp+20+max_args*4]
%endrep
call r0
xor r3, n3
xor r4, n4
xor r5, n5
xor r6, n6
or r3, r4
or r5, r6
or r3, r5
jz .ok
mov r3, eax
lea r0, [error_message]
mov [esp], r0
call fail_func
mov eax, r3
.ok:
add esp, max_args*4
REP_RET
%endif ; ARCH_X86_64
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