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Add a test for the "swap idiom", which LLVM should be able to unravel.

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llvm-svn: 11491
This commit is contained in:
Chris Lattner 2004-02-16 03:53:44 +00:00
parent 71154f0931
commit 64b01e562c
1 changed files with 14 additions and 0 deletions
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14
test/Regression/Transforms/InstCombine/xor.ll
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@ -3,6 +3,9 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep 'xor '
%G1 = global uint 0
%G2 = global uint 0
implementation
bool %test0(bool %A) {
@ -128,3 +131,14 @@ uint %test19(uint %A, uint %B) {
%D = xor uint %C, %A ; A terms cancel, D = B
ret uint %D
}
void %test20(uint %A, uint %B) { ; The "swap idiom"
%tmp.2 = xor uint %B, %A
%tmp.5 = xor uint %tmp.2, %B
%tmp.8 = xor uint %tmp.5, %tmp.2
store uint %tmp.8, uint* %G1 ; tmp.8 = B
store uint %tmp.5, uint* %G2 ; tmp.5 = A
ret void
}