mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-23 17:29:19 +00:00
Don't try to pull vector bitcasts that change the number of elements through
a select. A vector select is pairwise on each element so we'd need a new condition with the right number of elements to select on. Fixes PR8994. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123963 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
7acdb4d237
commit
acf4a7c0e6
@ -455,8 +455,9 @@ Value *InstCombiner::dyn_castFNegVal(Value *V) const {
|
||||
|
||||
static Value *FoldOperationIntoSelectOperand(Instruction &I, Value *SO,
|
||||
InstCombiner *IC) {
|
||||
if (CastInst *CI = dyn_cast<CastInst>(&I))
|
||||
if (CastInst *CI = dyn_cast<CastInst>(&I)) {
|
||||
return IC->Builder->CreateCast(CI->getOpcode(), SO, I.getType());
|
||||
}
|
||||
|
||||
// Figure out if the constant is the left or the right argument.
|
||||
bool ConstIsRHS = isa<Constant>(I.getOperand(1));
|
||||
@ -498,11 +499,24 @@ Instruction *InstCombiner::FoldOpIntoSelect(Instruction &Op, SelectInst *SI) {
|
||||
// Bool selects with constant operands can be folded to logical ops.
|
||||
if (SI->getType()->isIntegerTy(1)) return 0;
|
||||
|
||||
// If it's a bitcast involving vectors, make sure it has the same number of
|
||||
// elements on both sides.
|
||||
if (BitCastInst *BC = dyn_cast<BitCastInst>(&Op)) {
|
||||
const VectorType *DestTy = dyn_cast<VectorType>(BC->getDestTy());
|
||||
const VectorType *SrcTy = dyn_cast<VectorType>(BC->getSrcTy());
|
||||
|
||||
// Verify that either both or neither are vectors.
|
||||
if ((SrcTy == NULL) != (DestTy == NULL)) return 0;
|
||||
// If vectors, verify that they have the same number of elements.
|
||||
if (SrcTy && SrcTy->getNumElements() != DestTy->getNumElements())
|
||||
return 0;
|
||||
}
|
||||
|
||||
Value *SelectTrueVal = FoldOperationIntoSelectOperand(Op, TV, this);
|
||||
Value *SelectFalseVal = FoldOperationIntoSelectOperand(Op, FV, this);
|
||||
|
||||
return SelectInst::Create(SI->getCondition(), SelectTrueVal,
|
||||
SelectFalseVal);
|
||||
return SelectInst::Create(SI->getCondition(),
|
||||
SelectTrueVal, SelectFalseVal);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
@ -689,3 +689,14 @@ define i64 @test50(i32 %a) nounwind {
|
||||
; CHECK-NEXT: %min = select i1 %is_a_nonpositive, i64 %a_ext, i64 2
|
||||
; CHECK-NEXT: ret i64 %min
|
||||
}
|
||||
|
||||
; PR8994
|
||||
|
||||
; Theis select instruction can't be eliminated because trying to do so would
|
||||
; change the number of vector elements. This used to assert.
|
||||
define i48 @test51(<3 x i1> %icmp, <3 x i16> %tmp) {
|
||||
%select = select <3 x i1> %icmp, <3 x i16> zeroinitializer, <3 x i16> %tmp
|
||||
; CHECK: select <3 x i1>
|
||||
%tmp2 = bitcast <3 x i16> %select to i48
|
||||
ret i48 %tmp2
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user