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GLdispatch: Improve the x86 TLS stubs performance.

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This save one call frame and a similar change for mesa shows that
glGetString performance increased from 118M/s to 128M/s on my desktop.
This commit is contained in:
Lepton Wu 2019-10-24 13:50:31 -07:00
parent a1a73db6b4
commit 1dea90a97c
1 changed files with 8 additions and 4 deletions
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12
src/GLdispatch/vnd-glapi/entry_x86_tls.c
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@ -38,7 +38,7 @@
#include "glapi.h"
#include "glvnd/GLdispatchABI.h"
#define ENTRY_STUB_ALIGN 16
#define ENTRY_STUB_ALIGN 32
#if !defined(GLDISPATCH_PAGE_SIZE)
#define GLDISPATCH_PAGE_SIZE 4096
#endif
@ -55,9 +55,13 @@ __asm__(".balign " U_STRINGIFY(GLDISPATCH_PAGE_SIZE) "\n"
".balign " U_STRINGIFY(ENTRY_STUB_ALIGN) "\n" \
func ":\n"
#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\t" \
"1:\n\t" \
"popl %eax\n\t" \
"addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %eax\n\t" \
"movl _glapi_tls_Current@GOTNTPOFF(%eax), %eax\n\t" \
"movl %gs:(%eax), %eax\n\t" \
"jmp *(4 * " slot ")(%eax)"
#define MAPI_TMP_STUB_ASM_GCC