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Make sure that pure calls don't kill loads

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llvm-svn: 12416
This commit is contained in:
Chris Lattner 2004-03-15 04:17:53 +00:00
parent 8a82176edc
commit e48c972a67
1 changed files with 13 additions and 0 deletions
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13
test/Regression/Transforms/GCSE/call_pure_function.ll Normal file
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; RUN: llvm-as < %s | opt -basicaa -load-vn -gcse -instcombine | llvm-dis | not grep sub
declare int %strlen(sbyte*)
declare void %use(int %X)
sbyte %test(sbyte* %P, sbyte* %Q) {
%A = load sbyte* %Q
%X = call int %strlen(sbyte* %P)
%B = load sbyte* %Q ;; CSE with A.
call void %use(int %X) ;; make strlen not dead
%C = sub sbyte %A, %B
ret sbyte %C
}