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| author | H. Peter Anvin <hpa@linux.intel.com> | 2010-10-14 01:00:29 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2010-10-14 01:00:29 +0200 |
| commit | d7acb92fea932ad2e7846480aeacddc2c03c8485 (patch) | |
| tree | 21675108634aff8885cb881a476acf7146191b87 /arch/x86/Makefile | |
| parent | i386: Make kernel_execve() suitable for stack unwinding (diff) | |
| download | linux-d7acb92fea932ad2e7846480aeacddc2c03c8485.tar.xz linux-d7acb92fea932ad2e7846480aeacddc2c03c8485.zip | |
x86-64, asm: If the assembler supports fxsave64, use it
Kbuild allows for us to probe for the existence of specific constructs
in the assembler, use them to find out if we can use fxsave64 and
permit the compiler to generate better code.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/Makefile')
| -rw-r--r-- | arch/x86/Makefile | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 8aa1b59b9074..40668a96ca0c 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -96,8 +96,12 @@ cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_en # is .cfi_signal_frame supported too? cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1) cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1) -KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) -KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) + +# does binutils support specific instructions? +asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1) + +KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) +KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) LDFLAGS := -m elf_$(UTS_MACHINE) |