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indvars -disable-iv-rewrite: just because SCEV ignores casts doesn't

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mean they can be removed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134054 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2011-06-29 03:13:40 +00:00
parent 2c0cbce763
commit 11745d4c02
2 changed files with 38 additions and 0 deletions
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1
lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -1007,6 +1007,7 @@ bool IndVarSimplify::EliminateIVUser(Instruction *UseInst,
// Eliminate any operation that SCEV can prove is an identity function.
if (!SE->isSCEVable(UseInst->getType()) ||
(UseInst->getType() != IVOperand->getType()) ||
(SE->getSCEV(UseInst) != SE->getSCEV(IVOperand)))
return false;

37
test/Transforms/IndVarSimplify/no-iv-rewrite.ll
View File

@ -23,6 +23,7 @@ ph:
; sext should be eliminated while preserving gep inboundsness.
; CHECK-NOT: sext
; CHECK: getelementptr inbounds
; CHECK: exit
loop:
%i.02 = phi i32 [ 0, %ph ], [ %iinc, %loop ]
%s.01 = phi i32 [ 0, %ph ], [ %sinc, %loop ]
@ -63,6 +64,7 @@ ph:
; CHECK: getelementptr inbounds
; %vall sext should obviously not be eliminated
; CHECK: sext
; CHECK: exit
loop:
%i.02 = phi i32 [ 0, %ph ], [ %iinc, %loop ]
%s.01 = phi i64 [ 0, %ph ], [ %sinc, %loop ]
@ -106,6 +108,7 @@ ph:
; Preserve gep inboundsness, and don't factor it.
; CHECK: getelementptr inbounds i32* %ptriv, i32 1
; CHECK-NOT: add
; CHECK: exit
loop:
%ptriv = phi i32* [ %first, %ph ], [ %ptrpost, %loop ]
%ofs = sext i32 %idx to i64
@ -121,3 +124,37 @@ exit:
return:
ret void
}
%struct = type { i32 }
define void @bitcastiv(i32 %start, i32 %limit, i32 %step, %struct* %base)
nounwind
{
entry:
br label %loop
; CHECK: loop:
;
; Preserve casts
; CHECK: phi i32
; CHECK: bitcast
; CHECK: getelementptr
; CHECK: exit
loop:
%iv = phi i32 [%start, %entry], [%next, %loop]
%p = phi %struct* [%base, %entry], [%pinc, %loop]
%adr = getelementptr %struct* %p, i32 0, i32 0
store i32 3, i32* %adr
%pp = bitcast %struct* %p to i32*
store i32 4, i32* %pp
%pinc = getelementptr %struct* %p, i32 1
%next = add i32 %iv, 1
%cond = icmp ne i32 %next, %limit
br i1 %cond, label %loop, label %exit
exit:
br label %return
return:
ret void
}