http://llvm.org/bugs/show_bug.cgi?id=10704
Summary: Do not automatically use SSE for math when SSE is
available
Product: dragonegg
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
GCC only uses SSE for floating point math if TARGET_SSE_MATH (there is also a
mysterious TARGET_MIX_SSE_I387), even if SSE is otherwise available. Add
support
for this. This means some changes to the X86 target. I think what is needed
is
for these tests for whether to use the FP stack to get more complicated:
def FPStackf32 : Predicate<"!Subtarget->hasXMM()">;
def FPStackf64 : Predicate<"!Subtarget->hasXMMInt()">;
Noticed when building wine on an x86-64 machine with -m32: GCC uses the
floating
point stack for math, while dragonegg uses SSE.
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