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Kconfig: Update on arch x86 Kconfig symbols.

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This commit add the Kconfig symbol SSE_FP_MATH.

Change-Id: I565a5a4665edbe72b40eb1e48a3279af98523034
Signed-off-by: Juan Manuel Cruz <juan.m.cruz.alcaraz@linux.intel.com>
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Juan Manuel Cruz 2015-05-09 21:30:47 -05:00 • committed by Anas Nashif
commit a25a5f76af
1 changed files with 17 additions and 0 deletions
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arch/x86/Kconfig
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@ -27,6 +27,23 @@ config SSE
Disabling this option means that no task or fiber may use SSEx
instructions; any such use will result in undefined behavior.
config SSE_FP_MATH
bool
prompt "Compiler-generated SSEx instructions" if FP_SHARING
depends on SSE && ISA_IA32
default n if FP_SHARING
default y if !FP_SHARING
help
This option allows the compiler to generate SSEx instructions for
performing floating point math. This can greatly improve performance
when exactly the same operations are to be performed on multiple
data objects; however, it can also significantly reduce performance
when pre-emptive task switches occur because of the larger register
set that must be saved and restored.
Disabling this option means that the compiler utilizes only the
x87 instruction set for floating point operations.
config FP_SHARING
bool
prompt "Floating point resource sharing" if !ENHANCED_SECURITY