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mapi: Improve the x86 tsd stubs performance.

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This skips touching %ebx most times and it shows that glGetString performance
increased from 114M/s to 120M/s on my desktop.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Lepton Wu <lepton@chromium.org>
This commit is contained in:
Lepton Wu 2019-10-29 17:52:21 -07:00 • committed by Matt Turner
parent 41407d5e9f
commit 1abf05764b
1 changed files with 6 additions and 5 deletions
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11
src/mapi/entry_x86_tsd.h
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@ -44,18 +44,19 @@ __asm__(".text\n"
func ":"
#define STUB_ASM_CODE(slot) \
"push %ebx\n\t" \
"call 1f\n\t" \
"1:\n\t" \
"popl %ebx\n\t" \
"addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx\n\t" \
"movl " ENTRY_CURRENT_TABLE "@GOT(%ebx), %eax\n\t" \
"popl %ecx\n\t" \
"addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ecx\n\t" \
"movl " ENTRY_CURRENT_TABLE "@GOT(%ecx), %eax\n\t" \
"mov (%eax), %eax\n\t" \
"testl %eax, %eax\n\t" \
"jne 1f\n\t" \
"push %ebx\n\t" \
"movl %ecx, %ebx\n\t" \
"call " ENTRY_CURRENT_TABLE_GET "@PLT\n\t" \
"popl %ebx\n\t" \
"1:\n\t" \
"pop %ebx\n\t" \
"jmp *(4 * " slot ")(%eax)"
#define MAPI_TMP_STUB_ASM_GCC