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just remove this xform which is subsumed by others.

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llvm-svn: 92775
This commit is contained in:
Chris Lattner 2010-01-05 21:16:30 +00:00
parent 173518e4ae
commit 13293b9738
2 changed files with 2 additions and 27 deletions
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25
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -680,32 +680,7 @@ Instruction *InstCombiner::visitTrunc(TruncInst &CI) {
Value *V2 = ConstantExpr::getTrunc(ShAmtV, DestTy);
return BinaryOperator::CreateShl(V1, V2);
}
// If we are discarding information from a simple binop, rewrite.
if (Src->hasOneUse() && isa<Instruction>(Src)) {
Instruction *SrcI = cast<Instruction>(Src);
switch (SrcI->getOpcode()) {
default: break;
case Instruction::Add:
// TODO: SUB?
case Instruction::Mul:
case Instruction::And:
case Instruction::Or:
case Instruction::Xor:
Value *Op0 = SrcI->getOperand(0);
Value *Op1 = SrcI->getOperand(1);
// Don't insert two casts unless at least one can be eliminated.
if (!ValueRequiresCast(Instruction::Trunc, Op1, DestTy) ||
!ValueRequiresCast(Instruction::Trunc, Op0, DestTy)) {
Op0 = Builder->CreateTrunc(Op0, DestTy, Op0->getName());
Op1 = Builder->CreateTrunc(Op1, DestTy, Op1->getName());
return BinaryOperator::Create(cast<BinaryOperator>(SrcI)->getOpcode(),
Op0, Op1);
}
}
}
return 0;
}

4
test/Transforms/InstCombine/sub.ll
View File

@ -223,8 +223,8 @@ define i32 @test23(i8* %P, i64 %A){
%G = sub i32 %D, %F
ret i32 %G
; CHECK: @test23
; CHECK: %A1 = trunc i64 %A to i32
; CHECK: ret i32 %A1
; CHECK-NEXT: = trunc i64 %A to i32
; CHECK-NEXT: ret i32
}
define i64 @test24(i8* %P, i64 %A){