llvm/test/Transforms/EarlyCSE/floatingpoint.ll
Geoff Berry aa61209f48 [EarlyCSE] Optionally use MemorySSA. NFC.
Summary:
Use MemorySSA, if requested, to do less conservative memory dependency
checking.

This change doesn't enable the MemorySSA enhanced EarlyCSE in the
default pipelines, so should be NFC.

Reviewers: dberlin, sanjoy, reames, majnemer

Subscribers: mcrosier, llvm-commits

Differential Revision: http://reviews.llvm.org/D19821

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280279 91177308-0d34-0410-b5e6-96231b3b80d8
2016-08-31 19:24:10 +00:00

16 lines
576 B
LLVM

; RUN: opt < %s -S -early-cse | FileCheck %s
; RUN: opt < %s -S -basicaa -early-cse-memssa | FileCheck %s
; Ensure we don't simplify away additions vectors of +0.0's (same as scalars).
define <4 x float> @fV( <4 x float> %a) {
; CHECK: %b = fadd <4 x float> %a, zeroinitializer
%b = fadd <4 x float> %a, <float 0.0,float 0.0,float 0.0,float 0.0>
ret <4 x float> %b
}
define <4 x float> @fW( <4 x float> %a) {
; CHECK: ret <4 x float> %a
%b = fadd <4 x float> %a, <float -0.0,float -0.0,float -0.0,float -0.0>
ret <4 x float> %b
}