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Revert r206045, "Fix shift by constants for vector."

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It broke some builders, at least, i686.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206153 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
NAKAMURA Takumi 2014-04-14 07:02:57 +00:00
parent 1907f75445
commit 9854380054
3 changed files with 21 additions and 95 deletions
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2
lib/Transforms/InstCombine/InstCombine.h
View File

@ -171,7 +171,7 @@ public:
ICmpInst::Predicate Pred);
Instruction *FoldGEPICmp(GEPOperator *GEPLHS, Value *RHS,
ICmpInst::Predicate Cond, Instruction &I);
Instruction *FoldShiftByConstant(Value *Op0, Constant *Op1,
Instruction *FoldShiftByConstant(Value *Op0, ConstantInt *Op1,
BinaryOperator &I);
Instruction *commonCastTransforms(CastInst &CI);
Instruction *commonPointerCastTransforms(CastInst &CI);

34
lib/Transforms/InstCombine/InstCombineShifts.cpp
View File

@ -33,7 +33,7 @@ Instruction *InstCombiner::commonShiftTransforms(BinaryOperator &I) {
if (Instruction *R = FoldOpIntoSelect(I, SI))
return R;
if (Constant *CUI = dyn_cast<Constant>(Op1))
if (ConstantInt *CUI = dyn_cast<ConstantInt>(Op1))
if (Instruction *Res = FoldShiftByConstant(Op0, CUI, I))
return Res;
@ -309,30 +309,20 @@ static Value *GetShiftedValue(Value *V, unsigned NumBits, bool isLeftShift,
Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, Constant *Op1,
Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, ConstantInt *Op1,
BinaryOperator &I) {
bool isLeftShift = I.getOpcode() == Instruction::Shl;
ConstantInt *COp1 = nullptr;
if (ConstantDataVector *CV = dyn_cast<ConstantDataVector>(Op1))
COp1 = dyn_cast_or_null<ConstantInt>(CV->getSplatValue());
else if (ConstantVector *CV = dyn_cast<ConstantVector>(Op1))
COp1 = dyn_cast_or_null<ConstantInt>(CV->getSplatValue());
else
COp1 = dyn_cast<ConstantInt>(Op1);
if (!COp1)
return nullptr;
// See if we can propagate this shift into the input, this covers the trivial
// cast of lshr(shl(x,c1),c2) as well as other more complex cases.
if (I.getOpcode() != Instruction::AShr &&
CanEvaluateShifted(Op0, COp1->getZExtValue(), isLeftShift, *this)) {
CanEvaluateShifted(Op0, Op1->getZExtValue(), isLeftShift, *this)) {
DEBUG(dbgs() << "ICE: GetShiftedValue propagating shift through expression"
" to eliminate shift:\n IN: " << *Op0 << "\n SH: " << I <<"\n");
return ReplaceInstUsesWith(I,
GetShiftedValue(Op0, COp1->getZExtValue(), isLeftShift, *this));
GetShiftedValue(Op0, Op1->getZExtValue(), isLeftShift, *this));
}
@ -343,7 +333,7 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, Constant *Op1,
// shl i32 X, 32 = 0 and srl i8 Y, 9 = 0, ... just don't eliminate
// a signed shift.
//
if (COp1->uge(TypeBits)) {
if (Op1->uge(TypeBits)) {
if (I.getOpcode() != Instruction::AShr)
return ReplaceInstUsesWith(I, Constant::getNullValue(Op0->getType()));
// ashr i32 X, 32 --> ashr i32 X, 31
@ -356,7 +346,7 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, Constant *Op1,
if (BO->getOpcode() == Instruction::Mul && isLeftShift)
if (Constant *BOOp = dyn_cast<Constant>(BO->getOperand(1)))
return BinaryOperator::CreateMul(BO->getOperand(0),
ConstantExpr::getShl(BOOp, COp1));
ConstantExpr::getShl(BOOp, Op1));
// Try to fold constant and into select arguments.
if (SelectInst *SI = dyn_cast<SelectInst>(Op0))
@ -377,7 +367,7 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, Constant *Op1,
if (TrOp && I.isLogicalShift() && TrOp->isShift() &&
isa<ConstantInt>(TrOp->getOperand(1))) {
// Okay, we'll do this xform. Make the shift of shift.
Constant *ShAmt = ConstantExpr::getZExt(COp1, TrOp->getType());
Constant *ShAmt = ConstantExpr::getZExt(Op1, TrOp->getType());
// (shift2 (shift1 & 0x00FF), c2)
Value *NSh = Builder->CreateBinOp(I.getOpcode(), TrOp, ShAmt,I.getName());
@ -394,10 +384,10 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, Constant *Op1,
// shift. We know that it is a logical shift by a constant, so adjust the
// mask as appropriate.
if (I.getOpcode() == Instruction::Shl)
MaskV <<= COp1->getZExtValue();
MaskV <<= Op1->getZExtValue();
else {
assert(I.getOpcode() == Instruction::LShr && "Unknown logical shift");
MaskV = MaskV.lshr(COp1->getZExtValue());
MaskV = MaskV.lshr(Op1->getZExtValue());
}
// shift1 & 0x00FF
@ -431,7 +421,7 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, Constant *Op1,
// (X + (Y << C))
Value *X = Builder->CreateBinOp(Op0BO->getOpcode(), YS, V1,
Op0BO->getOperand(1)->getName());
uint32_t Op1Val = COp1->getLimitedValue(TypeBits);
uint32_t Op1Val = Op1->getLimitedValue(TypeBits);
return BinaryOperator::CreateAnd(X, ConstantInt::get(I.getContext(),
APInt::getHighBitsSet(TypeBits, TypeBits-Op1Val)));
}
@ -463,7 +453,7 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, Constant *Op1,
// (X + (Y << C))
Value *X = Builder->CreateBinOp(Op0BO->getOpcode(), V1, YS,
Op0BO->getOperand(0)->getName());
uint32_t Op1Val = COp1->getLimitedValue(TypeBits);
uint32_t Op1Val = Op1->getLimitedValue(TypeBits);
return BinaryOperator::CreateAnd(X, ConstantInt::get(I.getContext(),
APInt::getHighBitsSet(TypeBits, TypeBits-Op1Val)));
}
@ -551,7 +541,7 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, Constant *Op1,
ConstantInt *ShiftAmt1C = cast<ConstantInt>(ShiftOp->getOperand(1));
uint32_t ShiftAmt1 = ShiftAmt1C->getLimitedValue(TypeBits);
uint32_t ShiftAmt2 = COp1->getLimitedValue(TypeBits);
uint32_t ShiftAmt2 = Op1->getLimitedValue(TypeBits);
assert(ShiftAmt2 != 0 && "Should have been simplified earlier");
if (ShiftAmt1 == 0) return 0; // Will be simplified in the future.
Value *X = ShiftOp->getOperand(0);

80
test/Transforms/InstCombine/shift.ll
View File

@ -36,52 +36,17 @@ define i32 @test4(i8 %A) {
define i32 @test5(i32 %A) {
; CHECK-LABEL: @test5(
; CHECK: ret i32 undef
%B = lshr i32 %A, 32 ;; shift all bits out
%B = lshr i32 %A, 32 ;; shift all bits out
ret i32 %B
}
define <4 x i32> @test5_splat_vector(<4 x i32> %A) {
; CHECK-LABEL: @test5_splat_vector(
; CHECK: ret <4 x i32> undef
%B = lshr <4 x i32> %A, <i32 32, i32 32, i32 32, i32 32> ;; shift all bits out
ret <4 x i32> %B
}
define <4 x i32> @test5_zero_vector(<4 x i32> %A) {
; CHECK-LABEL: @test5_zero_vector(
; CHECK-NEXT: ret <4 x i32> %A
%B = lshr <4 x i32> %A, zeroinitializer
ret <4 x i32> %B
}
define <4 x i32> @test5_non_splat_vector(<4 x i32> %A) {
; CHECK-LABEL: @test5_non_splat_vector(
; CHECK-NOT: ret <4 x i32> undef
%B = shl <4 x i32> %A, <i32 32, i32 1, i32 2, i32 3>
ret <4 x i32> %B
}
define i32 @test5a(i32 %A) {
; CHECK-LABEL: @test5a(
; CHECK: ret i32 undef
%B = shl i32 %A, 32 ;; shift all bits out
%B = shl i32 %A, 32 ;; shift all bits out
ret i32 %B
}
define <4 x i32> @test5a_splat_vector(<4 x i32> %A) {
; CHECK-LABEL: @test5a_splat_vector(
; CHECK: ret <4 x i32> undef
%B = shl <4 x i32> %A, <i32 32, i32 32, i32 32, i32 32> ;; shift all bits out
ret <4 x i32> %B
}
define <4 x i32> @test5a_non_splat_vector(<4 x i32> %A) {
; CHECK-LABEL: @test5a_non_splat_vector(
; CHECK-NOT: ret <4 x i32> undef
%B = shl <4 x i32> %A, <i32 32, i32 1, i32 2, i32 3>
ret <4 x i32> %B
}
define i32 @test5b() {
; CHECK-LABEL: @test5b(
; CHECK: ret i32 -1
@ -117,7 +82,7 @@ define i32 @test6a(i32 %A) {
define i32 @test7(i8 %A) {
; CHECK-LABEL: @test7(
; CHECK-NEXT: ret i32 -1
%shift.upgrd.3 = zext i8 %A to i32
%shift.upgrd.3 = zext i8 %A to i32
%B = ashr i32 -1, %shift.upgrd.3 ;; Always equal to -1
ret i32 %B
}
@ -267,7 +232,7 @@ define i1 @test16(i32 %X) {
; CHECK-NEXT: and i32 %X, 16
; CHECK-NEXT: icmp ne i32
; CHECK-NEXT: ret i1
%tmp.3 = ashr i32 %X, 4
%tmp.3 = ashr i32 %X, 4
%tmp.6 = and i32 %tmp.3, 1
%tmp.7 = icmp ne i32 %tmp.6, 0
ret i1 %tmp.7
@ -400,12 +365,12 @@ define i1 @test27(i32 %x) nounwind {
%z = trunc i32 %y to i1
ret i1 %z
}
define i8 @test28(i8 %x) {
entry:
; CHECK-LABEL: @test28(
; CHECK: icmp slt i8 %x, 0
; CHECK-NEXT: br i1
; CHECK-NEXT: br i1
%tmp1 = lshr i8 %x, 7
%cond1 = icmp ne i8 %tmp1, 0
br i1 %cond1, label %bb1, label %bb2
@ -511,7 +476,7 @@ entry:
%ins = or i128 %tmp23, %tmp27
%tmp45 = lshr i128 %ins, 64
ret i128 %tmp45
; CHECK-LABEL: @test36(
; CHECK: %tmp231 = or i128 %B, %A
; CHECK: %ins = and i128 %tmp231, 18446744073709551615
@ -527,7 +492,7 @@ entry:
%tmp45 = lshr i128 %ins, 64
%tmp46 = trunc i128 %tmp45 to i64
ret i64 %tmp46
; CHECK-LABEL: @test37(
; CHECK: %tmp23 = shl nuw nsw i128 %tmp22, 32
; CHECK: %ins = or i128 %tmp23, %A
@ -815,32 +780,3 @@ bb11: ; preds = %bb8
bb12: ; preds = %bb11, %bb8, %bb
ret void
}
define i32 @test64(i32 %a) {
; CHECK-LABEL: @test64(
; CHECK-NEXT: ret i32 undef
%b = ashr i32 %a, 32 ; shift all bits out
ret i32 %b
}
define <4 x i32> @test64_splat_vector(<4 x i32> %a) {
; CHECK-LABEL: @test64_splat_vector
; CHECK-NEXT: ret <4 x i32> undef
%b = ashr <4 x i32> %a, <i32 32, i32 32, i32 32, i32 32> ; shift all bits out
ret <4 x i32> %b
}
define <4 x i32> @test64_non_splat_vector(<4 x i32> %a) {
; CHECK-LABEL: @test64_non_splat_vector
; CHECK-NOT: ret <4 x i32> undef
%b = ashr <4 x i32> %a, <i32 32, i32 0, i32 1, i32 2> ; shift all bits out
ret <4 x i32> %b
}
define <2 x i65> @test_65(<2 x i64> %t) {
; CHECK-LABEL: @test_65
%a = zext <2 x i64> %t to <2 x i65>
%sext = shl <2 x i65> %a, <i65 33, i65 33>
%b = ashr <2 x i65> %sext, <i65 33, i65 33>
ret <2 x i65> %b
}