llvm-6502/test/CodeGen/X86/shrink-fp-const1.ll
Evan Cheng 6fd599fa69 Add a target lowering hook to control whether it's worthwhile to compress fp constant.
For x86, if sse2 is available, it's not a good idea since cvtss2sd is slower than a movsd load and it prevents load folding. On x87, it's important to shrink fp constant since fldt is very expensive.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47931 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-05 01:30:59 +00:00

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LLVM

; RUN: llvm-as < %s | llc -march=x86-64 -mattr=+sse2 | not grep cvtss2sd
; PR1264
define double @foo(double %x) {
%y = mul double %x, 5.000000e-01
ret double %y
}