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Enhance instcombine to be more aggressive about folding casts of

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operations of casts.  This implements InstCombine/zext-fold.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40726 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-08-02 06:11:14 +00:00
parent bfbfcdafbe
commit 951626b437
2 changed files with 54 additions and 32 deletions
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12
test/Transforms/InstCombine/zext-fold.ll Normal file
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@@ -0,0 +1,12 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {zext } | wc -l | grep 1
; PR1570
define i32 @test2(float %X, float %Y) {
entry:
%tmp3 = fcmp uno float %X, %Y ; <i1> [#uses=1]
%tmp34 = zext i1 %tmp3 to i8 ; <i8> [#uses=1]
%tmp = xor i8 %tmp34, 1 ; <i8> [#uses=1]
%toBoolnot5 = zext i8 %tmp to i32 ; <i32> [#uses=1]
ret i32 %toBoolnot5
}