PR #21421 opened by Zhao Zhili (quink)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21421
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21421.patch
For example, check the flag and set a function for test:
if (ff_is_cpu_flags_test)
c->bswap_buf = bswap_buf_2;
Run the test:
./tests/checkasm/checkasm --test=bswapdsp --bench=bswap_buf
bswap_buf_c: 0.5 ( 1.00x)
bswap_buf_test: 0.3 ( 2.04x)
Signed-off-by: Zhao Zhili <[email protected]>
>From 91e1ac15a456f3a2b2a28984c57ad366df28d611 Mon Sep 17 00:00:00 2001
From: Zhao Zhili <[email protected]>
Date: Sat, 10 Jan 2026 01:03:37 +0800
Subject: [PATCH] tests/checkasm: add a fake cpu flag for benchmarking two C
functions
For example, check the flag and set a function for test:
if (ff_is_cpu_flags_test)
c->bswap_buf = bswap_buf_2;
Run the test:
./tests/checkasm/checkasm --test=bswapdsp --bench=bswap_buf
bswap_buf_c: 0.5 ( 1.00x)
bswap_buf_test: 0.3 ( 2.04x)
Signed-off-by: Zhao Zhili <[email protected]>
---
libavutil/cpu_internal.h | 4 ++++
tests/checkasm/checkasm.c | 15 +++++++++++----
2 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/libavutil/cpu_internal.h b/libavutil/cpu_internal.h
index 8dca62334a..7f36fecd49 100644
--- a/libavutil/cpu_internal.h
+++ b/libavutil/cpu_internal.h
@@ -44,6 +44,10 @@
#define CPUEXT_FAST(flags, cpuext) CPUEXT_SUFFIX_FAST(flags, , cpuext)
#define CPUEXT_SLOW(flags, cpuext) CPUEXT_SUFFIX_SLOW(flags, , cpuext)
+/* Fake CPU flag for testing only */
+#define AV_CPU_FLAG_TEST 0x80000000
+#define ff_is_cpu_flags_test (av_get_cpu_flags() & AV_CPU_FLAG_TEST)
+
int ff_get_cpu_flags_mips(void);
int ff_get_cpu_flags_aarch64(void);
int ff_get_cpu_flags_arm(void);
diff --git a/tests/checkasm/checkasm.c b/tests/checkasm/checkasm.c
index 7dcdaeb2a4..8eb7e366bd 100644
--- a/tests/checkasm/checkasm.c
+++ b/tests/checkasm/checkasm.c
@@ -60,7 +60,7 @@
#include "checkasm.h"
#include "libavutil/avassert.h"
#include "libavutil/common.h"
-#include "libavutil/cpu.h"
+#include "libavutil/cpu_internal.h"
#include "libavutil/intfloat.h"
#include "libavutil/random_seed.h"
@@ -420,6 +420,9 @@ static const struct {
#elif ARCH_WASM
{ "SIMD128", "simd128", AV_CPU_FLAG_SIMD128 },
#endif
+
+ /* Don't put any flag after this one */
+ { "TEST", "test", AV_CPU_FLAG_TEST },
{ NULL }
};
@@ -861,9 +864,13 @@ static void check_cpu_flag(const char *name, int flag)
{
int old_cpu_flag = state.cpu_flag;
- flag |= old_cpu_flag;
- av_force_cpu_flags(-1);
- state.cpu_flag = flag & av_get_cpu_flags();
+ if (flag == AV_CPU_FLAG_TEST) {
+ state.cpu_flag = flag;
+ } else {
+ flag |= old_cpu_flag;
+ av_force_cpu_flags(-1);
+ state.cpu_flag = flag & av_get_cpu_flags();
+ }
av_force_cpu_flags(state.cpu_flag);
if (!flag || state.cpu_flag != old_cpu_flag) {
--
2.49.1
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