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Check that GVN performs this transform even if the calls 

themselves are not marked readonly, but only the called
functions.

llvm-svn: 84253
This commit is contained in:
Duncan Sands 2009-10-16 12:18:23 +00:00
parent ca019e704c
commit de3f2c26c6
1 changed files with 14 additions and 14 deletions
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28
llvm/test/Transforms/GVN/calls-readonly.ll
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@ -6,22 +6,22 @@ target triple = "i386-apple-darwin7"
define i8* @test(i8* %P, i8* %Q, i32 %x, i32 %y) nounwind readonly { define i8* @test(i8* %P, i8* %Q, i32 %x, i32 %y) nounwind readonly {
entry: entry:
%0 = tail call i32 @strlen(i8* %P) nounwind readonly ; <i32> [#uses=2] %0 = tail call i32 @strlen(i8* %P) ; <i32> [#uses=2]
%1 = icmp eq i32 %0, 0 ; <i1> [#uses=1] %1 = icmp eq i32 %0, 0 ; <i1> [#uses=1]
br i1 %1, label %bb, label %bb1 br i1 %1, label %bb, label %bb1
bb: ; preds = %entry bb: ; preds = %entry
%2 = sdiv i32 %x, %y ; <i32> [#uses=1] %2 = sdiv i32 %x, %y ; <i32> [#uses=1]
br label %bb1 br label %bb1
bb1: ; preds = %bb, %entry bb1: ; preds = %bb, %entry
%x_addr.0 = phi i32 [ %2, %bb ], [ %x, %entry ] ; <i32> [#uses=1] %x_addr.0 = phi i32 [ %2, %bb ], [ %x, %entry ] ; <i32> [#uses=1]
%3 = tail call i8* @strchr(i8* %Q, i32 97) nounwind readonly ; <i8*> [#uses=1] %3 = tail call i8* @strchr(i8* %Q, i32 97) ; <i8*> [#uses=1]
%4 = tail call i32 @strlen(i8* %P) nounwind readonly ; <i32> [#uses=1] %4 = tail call i32 @strlen(i8* %P) ; <i32> [#uses=1]
%5 = add i32 %x_addr.0, %0 ; <i32> [#uses=1] %5 = add i32 %x_addr.0, %0 ; <i32> [#uses=1]
%.sum = sub i32 %5, %4 ; <i32> [#uses=1] %.sum = sub i32 %5, %4 ; <i32> [#uses=1]
%6 = getelementptr i8* %3, i32 %.sum ; <i8*> [#uses=1] %6 = getelementptr i8* %3, i32 %.sum ; <i8*> [#uses=1]
ret i8* %6 ret i8* %6
} }
declare i32 @strlen(i8*) nounwind readonly declare i32 @strlen(i8*) nounwind readonly