Mesa (master): mapi: Improve the x86 tsd stubs performance.
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Wed Oct 30 03:51:20 UTC 2019
Module: Mesa
Branch: master
Commit: 1abf05764bacaa8828ffc8b08848d07b1ad3272c
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=1abf05764bacaa8828ffc8b08848d07b1ad3272c
Author: Lepton Wu <lepton at chromium.org>
Date: Tue Oct 29 17:52:21 2019 -0700
mapi: Improve the x86 tsd stubs performance.
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 at gmail.com>
Signed-off-by: Lepton Wu <lepton at chromium.org>
---
src/mapi/entry_x86_tsd.h | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/src/mapi/entry_x86_tsd.h b/src/mapi/entry_x86_tsd.h
index bd8db7b19f9..9526cdcef1a 100644
--- a/src/mapi/entry_x86_tsd.h
+++ b/src/mapi/entry_x86_tsd.h
@@ -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
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