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the code in GVN that tries to forward large loads to small

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stores is not phi translating, thus it miscompiles really
crazy testcases.  This is from inspection, I haven't seen
this in the wild.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90930 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-12-09 02:43:05 +00:00
parent b3f927f6dd
commit 55fe79f044
1 changed files with 54 additions and 0 deletions
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54
test/Transforms/GVN/rle.ll
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@ -466,3 +466,57 @@ exit:
ret i32 -1
}
define i8 @phi_trans4(i8* %p) {
; CHECK: @phi_trans4
entry:
%X = getelementptr i8* %p, i32 4
%Y = load i8* %X
br label %loop
loop:
%i = phi i32 [4, %entry], [192, %loop]
%X2 = getelementptr i8* %p, i32 %i
%Y2 = load i8* %X
%cond = call i1 @cond2()
%Z = bitcast i8 *%X2 to i32*
store i32 0, i32* %Z
br i1 %cond, label %loop, label %out
out:
%R = add i8 %Y, %Y2
ret i8 %R
}
define i8 @phi_trans5(i8* %p) {
; CHECK: @phi_trans5
entry:
%X4 = getelementptr i8* %p, i32 2
store i8 19, i8* %X4
%X = getelementptr i8* %p, i32 4
%Y = load i8* %X
br label %loop
loop:
%i = phi i32 [4, %entry], [3, %cont]
%X2 = getelementptr i8* %p, i32 %i
%Y2 = load i8* %X2
;; FIXME: This load is being incorrectly replaced!
%cond = call i1 @cond2()
br i1 %cond, label %cont, label %out
cont:
%Z = getelementptr i8* %X2, i32 -1
%Z2 = bitcast i8 *%Z to i32*
store i32 50462976, i32* %Z2 ;; (1 << 8) | (2 << 16) | (3 << 24)
br label %loop
out:
%R = add i8 %Y, %Y2
ret i8 %R
}