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[InstCombine] use m_APInt to allow icmp eq (add X, C1), C2 folds for splat constant vectors 

llvm-svn: 277659
This commit is contained in:
Sanjay Patel 2016-08-03 22:08:44 +00:00
parent 129e709a03
commit 00a324e893
3 changed files with 10 additions and 13 deletions
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14
llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
View File

@ -2227,13 +2227,14 @@ Instruction *InstCombiner::foldICmpEqualityWithConstant(ICmpInst &ICI) {
}
}
break;
case Instruction::Add:
case Instruction::Add: {
// Replace ((add A, B) != C) with (A != C-B) if B & C are constants.
// FIXME: Vectors are excluded by ConstantInt.
if (ConstantInt *BOp1C = dyn_cast<ConstantInt>(BOp1)) {
if (BO->hasOneUse())
return new ICmpInst(ICI.getPredicate(), BOp0,
ConstantExpr::getSub(RHS, BOp1C));
const APInt *BOC;
if (match(BOp1, m_APInt(BOC))) {
if (BO->hasOneUse()) {
Constant *SubC = ConstantExpr::getSub(RHS, cast<Constant>(BOp1));
return new ICmpInst(ICI.getPredicate(), BOp0, SubC);
}
} else if (*RHSV == 0) {
// Replace ((add A, B) != 0) with (A != -B) if A or B is
// efficiently invertible, or if the add has just this one use.
@ -2248,6 +2249,7 @@ Instruction *InstCombiner::foldICmpEqualityWithConstant(ICmpInst &ICI) {
}
}
break;
}
case Instruction::Xor:
if (BO->hasOneUse()) {
if (Constant *BOC = dyn_cast<Constant>(BOp1)) {

4
llvm/test/Transforms/InstCombine/add.ll
View File

@ -264,11 +264,9 @@ define i1 @test21(i32 %x) {
ret i1 %y
}
; FIXME: Vectors should fold the same way.
define <2 x i1> @test21vec(<2 x i32> %x) {
; CHECK-LABEL: @test21vec(
; CHECK-NEXT: [[T:%.*]] = add <2 x i32> %x, <i32 4, i32 4>
; CHECK-NEXT: [[Y:%.*]] = icmp eq <2 x i32> [[T]], <i32 123, i32 123>
; CHECK-NEXT: [[Y:%.*]] = icmp eq <2 x i32> %x, <i32 119, i32 119>
; CHECK-NEXT: ret <2 x i1> [[Y]]
;
%t = add <2 x i32> %x, <i32 4, i32 4>

5
llvm/test/Transforms/InstCombine/icmp.ll
View File

@ -1004,12 +1004,9 @@ define i1 @test70(i32 %X) {
ret i1 %C
}
; FIXME: Vectors should fold the same way.
define <2 x i1> @test70vec(<2 x i32> %X) {
; CHECK-LABEL: @test70vec(
; CHECK-NEXT: [[B:%.*]] = add <2 x i32> %X, <i32 2, i32 2>
; CHECK-NEXT: [[C:%.*]] = icmp ne <2 x i32> [[B]], <i32 4, i32 4>
; CHECK-NEXT: [[C:%.*]] = icmp ne <2 x i32> %X, <i32 2, i32 2>
; CHECK-NEXT: ret <2 x i1> [[C]]
;
%B = add <2 x i32> %X, <i32 2, i32 2>