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Remove volatile from variables to improve performance

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BUG=libyuv:703
TEST=compile and disassemble.  see registers used not stack.
R=wangcheng@google.com

Change-Id: Iaa07ee5d0c35252994491bb2868276e161149efd
Reviewed-on: https://chromium-review.googlesource.com/500427
Commit-Queue: Frank Barchard <fbarchard@google.com>
Reviewed-by: Cheng Wang <wangcheng@google.com>
This commit is contained in:
Frank Barchard 2017-05-09 10:54:39 -07:00
parent 2136e349da
commit bbbf30eecd
4 changed files with 7 additions and 7 deletions
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4
source/compare_common.cc
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@ -19,7 +19,7 @@ extern "C" {
#if ORIGINAL_C
uint32 HammingDistance_C(const uint8* src_a, const uint8* src_b, int count) {
volatile uint32 diff = 0u;
uint32 diff = 0u;
int i;
for (i = 0; i < count; ++i) {
@ -39,7 +39,7 @@ uint32 HammingDistance_C(const uint8* src_a, const uint8* src_b, int count) {
// Hakmem method for hamming distance.
uint32 HammingDistance_C(const uint8* src_a, const uint8* src_b, int count) {
volatile uint32 diff = 0u;
uint32 diff = 0u;
int i;
for (i = 0; i < count - 3; i += 4) {

2
source/compare_gcc.cc
View File

@ -23,7 +23,7 @@ extern "C" {
(defined(__x86_64__) || (defined(__i386__) && !defined(_MSC_VER)))
uint32 HammingDistance_X86(const uint8* src_a, const uint8* src_b, int count) {
volatile uint32 diff = 0u;
uint32 diff = 0u;
int i;
for (i = 0; i < count - 7; i += 8) {

2
source/compare_neon.cc
View File

@ -22,7 +22,7 @@ extern "C" {
!defined(__aarch64__)
uint32 SumSquareError_NEON(const uint8* src_a, const uint8* src_b, int count) {
volatile uint32 sse;
uint32 sse;
asm volatile (
"vmov.u8 q8, #0 \n"
"vmov.u8 q10, #0 \n"

6
source/compare_neon64.cc
View File

@ -22,7 +22,7 @@ extern "C" {
#if 0
uint32 HammingDistance_NEON(const uint8* src_a, const uint8* src_b, int count) {
volatile uint32 diff;
uint32 diff;
asm volatile (
"eor v4.16b, v4.16b, v4.16b \n"
"eor v5.16b, v5.16b, v5.16b \n"
@ -51,7 +51,7 @@ uint32 HammingDistance_NEON(const uint8* src_a, const uint8* src_b, int count) {
#endif
uint32 HammingDistance_NEON(const uint8* src_a, const uint8* src_b, int count) {
volatile uint32 diff;
uint32 diff;
asm volatile (
"movi d6, #0 \n"
@ -82,7 +82,7 @@ uint32 HammingDistance_NEON(const uint8* src_a, const uint8* src_b, int count) {
}
uint32 SumSquareError_NEON(const uint8* src_a, const uint8* src_b, int count) {
volatile uint32 sse;
uint32 sse;
asm volatile (
"eor v16.16b, v16.16b, v16.16b \n"
"eor v18.16b, v18.16b, v18.16b \n"