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mapi: Inline call x86_current_tls.

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This saves one return and a simple benchmark which calls glGetString
repeatedly on my desktop shows it improves calls per second from 118M
to 128M.

Signed-off-by: Lepton Wu <lepton@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
This commit is contained in:
Lepton Wu
2019-10-21 20:22:18 -07:00
parent a4fec4dd6a
commit e137b3a9b7
1 changed files with 7 additions and 3 deletions
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10
src/mapi/entry_x86_tls.h
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@@ -56,9 +56,13 @@ __asm__(".balign 16\n"
".balign 16\n" \
func ":"
#define STUB_ASM_CODE(slot) \
"call x86_current_tls\n\t" \
"movl %gs:(%eax), %eax\n\t" \
#define STUB_ASM_CODE(slot) \
"call 1f\n" \
"1:\n\t" \
"popl %eax\n\t" \
"addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %eax\n\t" \
"movl " ENTRY_CURRENT_TABLE "@GOTNTPOFF(%eax), %eax\n\t" \
"movl %gs:(%eax), %eax\n\t" \
"jmp *(4 * " slot ")(%eax)"
#define MAPI_TMP_STUB_ASM_GCC