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[InstCombine] Use InstSimplify in FoldOpIntoSelect #116073

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merged 3 commits into from
Nov 18, 2024
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[InstCombine] Use InstSimplify in FoldOpIntoSelect #116073

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3cdb018
[InstCombine] Use InstSimplify in FoldOpIntoSelect
nikic Nov 13, 2024
d501224
style
nikic Nov 14, 2024
1e9925a
regenerate new tests
nikic Nov 15, 2024
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36 changes: 15 additions & 21 deletions llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
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Expand Up @@ -1649,39 +1649,34 @@ Instruction *InstCombinerImpl::foldBinopOfSextBoolToSelect(BinaryOperator &BO) {
return SelectInst::Create(X, TVal, FVal);
}

static Constant *constantFoldOperationIntoSelectOperand(Instruction &I,
SelectInst *SI,
bool IsTrueArm) {
SmallVector<Constant *> ConstOps;
static Value *simplifyOperationIntoSelectOperand(Instruction &I, SelectInst *SI,
bool IsTrueArm) {
SmallVector<Value *> Ops;
for (Value *Op : I.operands()) {
Constant *C = nullptr;
Value *V = nullptr;
if (Op == SI) {
C = dyn_cast<Constant>(IsTrueArm ? SI->getTrueValue()
: SI->getFalseValue());
V = IsTrueArm ? SI->getTrueValue() : SI->getFalseValue();
} else if (match(SI->getCondition(),
m_SpecificICmp(IsTrueArm ? ICmpInst::ICMP_EQ
: ICmpInst::ICMP_NE,
m_Specific(Op), m_Constant(C))) &&
isGuaranteedNotToBeUndefOrPoison(C)) {
m_Specific(Op), m_Value(V))) &&
isGuaranteedNotToBeUndefOrPoison(V)) {
// Pass
} else {
C = dyn_cast<Constant>(Op);
V = Op;
}
if (C == nullptr)
return nullptr;

ConstOps.push_back(C);
Ops.push_back(V);
}

return ConstantFoldInstOperands(&I, ConstOps, I.getDataLayout());
return simplifyInstructionWithOperands(&I, Ops, I.getDataLayout());
}

static Value *foldOperationIntoSelectOperand(Instruction &I, SelectInst *SI,
Value *NewOp, InstCombiner &IC) {
Instruction *Clone = I.clone();
Clone->replaceUsesOfWith(SI, NewOp);
Clone->dropUBImplyingAttrsAndMetadata();
IC.InsertNewInstBefore(Clone, SI->getIterator());
IC.InsertNewInstBefore(Clone, I.getIterator());
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Can you explain this change?

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Consider this test:

define i32 @sel_umin_simplify(i1 %c, i32 %x, i16 %y) {
  %sel = select i1 %c, i32 %x, i32 0
  %y.ext = zext i16 %y to i32
  %res = call i32 @llvm.umin.i32(i32 %sel, i32 %y.ext)
  ret i32 %res
}

If we insert the umin clone before the select, it still uses %y.ext, which is only defined after the select, so we get a verifier error. Inserting the instruction at the same position as the old one makes sure that we don't violate the dominance requirement.

I believe this previously wasn't an issue because the transform would bail out anyway if the non-select operands were non-constant, so we didn't run into the problem.

return Clone;
}

Expand All @@ -1693,8 +1688,6 @@ Instruction *InstCombinerImpl::FoldOpIntoSelect(Instruction &Op, SelectInst *SI,

Value *TV = SI->getTrueValue();
Value *FV = SI->getFalseValue();
if (!(isa<Constant>(TV) || isa<Constant>(FV)))
return nullptr;

// Bool selects with constant operands can be folded to logical ops.
if (SI->getType()->isIntOrIntVectorTy(1))
Expand All @@ -1715,9 +1708,10 @@ Instruction *InstCombinerImpl::FoldOpIntoSelect(Instruction &Op, SelectInst *SI,
}
}

// Make sure that one of the select arms constant folds successfully.
Value *NewTV = constantFoldOperationIntoSelectOperand(Op, SI, /*IsTrueArm*/ true);
Value *NewFV = constantFoldOperationIntoSelectOperand(Op, SI, /*IsTrueArm*/ false);
// Make sure that one of the select arms folds successfully.
Value *NewTV = simplifyOperationIntoSelectOperand(Op, SI, /*IsTrueArm=*/true);
Value *NewFV =
simplifyOperationIntoSelectOperand(Op, SI, /*IsTrueArm=*/false);
if (!NewTV && !NewFV)
return nullptr;

Expand Down
8 changes: 4 additions & 4 deletions llvm/test/Transforms/InstCombine/cast-mul-select.ll
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Expand Up @@ -73,10 +73,10 @@ define i8 @select2(i1 %cond, i8 %x, i8 %y, i8 %z) {
; DBGINFO-NEXT: #dbg_value(i8 [[Z:%.*]], [[META39:![0-9]+]], !DIExpression(DW_OP_LLVM_convert, 8, DW_ATE_unsigned, DW_OP_LLVM_convert, 32, DW_ATE_unsigned, DW_OP_stack_value), [[META45:![0-9]+]])
; DBGINFO-NEXT: [[D:%.*]] = add i8 [[X]], [[Y]], !dbg [[DBG46:![0-9]+]]
; DBGINFO-NEXT: #dbg_value(!DIArgList(i8 [[X]], i8 [[Y]]), [[META40:![0-9]+]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_convert, 8, DW_ATE_unsigned, DW_OP_LLVM_convert, 32, DW_ATE_unsigned, DW_OP_LLVM_arg, 1, DW_OP_LLVM_convert, 8, DW_ATE_unsigned, DW_OP_LLVM_convert, 32, DW_ATE_unsigned, DW_OP_plus, DW_OP_stack_value), [[DBG46]])
; DBGINFO-NEXT: [[E:%.*]] = select i1 [[COND:%.*]], i8 [[Z]], i8 [[D]], !dbg [[DBG47:![0-9]+]]
; DBGINFO-NEXT: #dbg_value(i32 poison, [[META41:![0-9]+]], !DIExpression(), [[DBG47]])
; DBGINFO-NEXT: #dbg_value(i8 [[E]], [[META42:![0-9]+]], !DIExpression(), [[META48:![0-9]+]])
; DBGINFO-NEXT: ret i8 [[E]], !dbg [[DBG49:![0-9]+]]
; DBGINFO-NEXT: #dbg_value(i32 poison, [[META41:![0-9]+]], !DIExpression(), [[META47:![0-9]+]])
; DBGINFO-NEXT: [[F:%.*]] = select i1 [[COND:%.*]], i8 [[Z]], i8 [[D]], !dbg [[META47]]
; DBGINFO-NEXT: #dbg_value(i8 [[F]], [[META42:![0-9]+]], !DIExpression(), [[META48:![0-9]+]])
; DBGINFO-NEXT: ret i8 [[F]], !dbg [[DBG49:![0-9]+]]
;
%A = zext i8 %x to i32
%B = zext i8 %y to i32
Expand Down
21 changes: 6 additions & 15 deletions llvm/test/Transforms/InstCombine/extract-select-agg.ll
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Expand Up @@ -56,14 +56,9 @@ define void @test_select_agg_multiuse(i1 %cond, i64 %v1, i64 %v2, i64 %v3, i64 %
; CHECK-LABEL: define void @test_select_agg_multiuse(
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Could you also add the tests from #115969?
I've tested them with this patch and it works correctly.

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I committed the extra tests in 3369424 and rebased this PR.

; CHECK-SAME: i1 [[COND:%.*]], i64 [[V1:%.*]], i64 [[V2:%.*]], i64 [[V3:%.*]], i64 [[V4:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[A0:%.*]] = insertvalue { i64, i64 } poison, i64 [[V1]], 0
; CHECK-NEXT: [[A1:%.*]] = insertvalue { i64, i64 } [[A0]], i64 [[V2]], 1
; CHECK-NEXT: [[B0:%.*]] = insertvalue { i64, i64 } poison, i64 [[V3]], 0
; CHECK-NEXT: [[B1:%.*]] = insertvalue { i64, i64 } [[B0]], i64 [[V4]], 1
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[COND]], { i64, i64 } [[A1]], { i64, i64 } [[B1]]
; CHECK-NEXT: [[X:%.*]] = extractvalue { i64, i64 } [[SEL]], 0
; CHECK-NEXT: [[X:%.*]] = select i1 [[COND]], i64 [[V1]], i64 [[V3]]
; CHECK-NEXT: call void @use(i64 [[X]])
; CHECK-NEXT: [[Y:%.*]] = extractvalue { i64, i64 } [[SEL]], 1
; CHECK-NEXT: [[Y:%.*]] = select i1 [[COND]], i64 [[V2]], i64 [[V4]]
; CHECK-NEXT: call void @use(i64 [[Y]])
; CHECK-NEXT: ret void
;
Expand All @@ -88,10 +83,8 @@ define i64 @test_extract_select_insert_left(ptr %p1, i64 %v) {
; CHECK-NEXT: [[CALL:%.*]] = call { ptr, i64 } @foo()
; CHECK-NEXT: [[ELM1:%.*]] = extractvalue { ptr, i64 } [[CALL]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i64 [[ELM1]], [[V]]
; CHECK-NEXT: [[FCA0:%.*]] = insertvalue { ptr, i64 } poison, ptr [[P1]], 0
; CHECK-NEXT: [[FCA1:%.*]] = insertvalue { ptr, i64 } [[FCA0]], i64 4294967294, 1
; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[CMP]], { ptr, i64 } [[FCA1]], { ptr, i64 } [[CALL]]
; CHECK-NEXT: [[RES:%.*]] = extractvalue { ptr, i64 } [[SELECT]], 1
; CHECK-NEXT: [[TMP1:%.*]] = extractvalue { ptr, i64 } [[CALL]], 1
; CHECK-NEXT: [[RES:%.*]] = select i1 [[CMP]], i64 4294967294, i64 [[TMP1]]
; CHECK-NEXT: ret i64 [[RES]]
;
%call = call { ptr, i64 } @foo()
Expand All @@ -110,10 +103,8 @@ define i64 @test_extract_select_insert_right(ptr %p1, i64 %v) {
; CHECK-NEXT: [[CALL:%.*]] = call { ptr, i64 } @foo()
; CHECK-NEXT: [[ELM1:%.*]] = extractvalue { ptr, i64 } [[CALL]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i64 [[ELM1]], [[V]]
; CHECK-NEXT: [[FCA0:%.*]] = insertvalue { ptr, i64 } poison, ptr [[P1]], 0
; CHECK-NEXT: [[FCA1:%.*]] = insertvalue { ptr, i64 } [[FCA0]], i64 4294967294, 1
; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[CMP]], { ptr, i64 } [[CALL]], { ptr, i64 } [[FCA1]]
; CHECK-NEXT: [[RES:%.*]] = extractvalue { ptr, i64 } [[SELECT]], 1
; CHECK-NEXT: [[TMP1:%.*]] = extractvalue { ptr, i64 } [[CALL]], 1
; CHECK-NEXT: [[RES:%.*]] = select i1 [[CMP]], i64 [[TMP1]], i64 4294967294
; CHECK-NEXT: ret i64 [[RES]]
;
%call = call { ptr, i64 } @foo()
Expand Down
6 changes: 3 additions & 3 deletions llvm/test/Transforms/InstCombine/fptrunc.ll
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Expand Up @@ -52,7 +52,7 @@ define <2 x half> @fmul_constant_op1(<2 x float> %x) {
define float @fptrunc_select_true_val(float %x, double %y, i1 %cond) {
; CHECK-LABEL: @fptrunc_select_true_val(
; CHECK-NEXT: [[TMP1:%.*]] = fptrunc double [[Y:%.*]] to float
; CHECK-NEXT: [[NARROW_SEL:%.*]] = select fast i1 [[COND:%.*]], float [[TMP1]], float [[X:%.*]]
; CHECK-NEXT: [[NARROW_SEL:%.*]] = select i1 [[COND:%.*]], float [[TMP1]], float [[X:%.*]]
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This was previously handled by

llvm-project/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp

Lines 1870 to 1887 in 2ca25ab

// If we are truncating a select that has an extended operand, we can
// narrow the other operand and do the select as a narrow op.
Value *Cond, *X, *Y;
if (match(Op, m_Select(m_Value(Cond), m_FPExt(m_Value(X)), m_Value(Y))) &&
X->getType() == Ty) {
// fptrunc (select Cond, (fpext X), Y --> select Cond, X, (fptrunc Y)
Value *NarrowY = Builder.CreateFPTrunc(Y, Ty);
Value *Sel = Builder.CreateSelect(Cond, X, NarrowY, "narrow.sel", Op);
return replaceInstUsesWith(FPT, Sel);
}
if (match(Op, m_Select(m_Value(Cond), m_Value(Y), m_FPExt(m_Value(X)))) &&
X->getType() == Ty) {
// fptrunc (select Cond, Y, (fpext X) --> select Cond, (fptrunc Y), X
Value *NarrowY = Builder.CreateFPTrunc(Y, Ty);
Value *Sel = Builder.CreateSelect(Cond, NarrowY, X, "narrow.sel", Op);
return replaceInstUsesWith(FPT, Sel);
}
}
, which preserves FMF.

However, I don't think that FMF preservation is actually correct. Let's say y is a big double and the fptrunc of it results in INF. Then we will violate ninf while we did not before.

I think we should drop that separate fold after this PR lands.

; CHECK-NEXT: ret float [[NARROW_SEL]]
;
%e = fpext float %x to double
Expand All @@ -64,7 +64,7 @@ define float @fptrunc_select_true_val(float %x, double %y, i1 %cond) {
define <2 x float> @fptrunc_select_false_val(<2 x float> %x, <2 x double> %y, <2 x i1> %cond) {
; CHECK-LABEL: @fptrunc_select_false_val(
; CHECK-NEXT: [[TMP1:%.*]] = fptrunc <2 x double> [[Y:%.*]] to <2 x float>
; CHECK-NEXT: [[NARROW_SEL:%.*]] = select nnan <2 x i1> [[COND:%.*]], <2 x float> [[X:%.*]], <2 x float> [[TMP1]]
; CHECK-NEXT: [[NARROW_SEL:%.*]] = select <2 x i1> [[COND:%.*]], <2 x float> [[X:%.*]], <2 x float> [[TMP1]]
; CHECK-NEXT: ret <2 x float> [[NARROW_SEL]]
;
%e = fpext <2 x float> %x to <2 x double>
Expand All @@ -80,7 +80,7 @@ define half @fptrunc_select_true_val_extra_use(half %x, float %y, i1 %cond) {
; CHECK-NEXT: [[E:%.*]] = fpext half [[X:%.*]] to float
; CHECK-NEXT: call void @use(float [[E]])
; CHECK-NEXT: [[TMP1:%.*]] = fptrunc float [[Y:%.*]] to half
; CHECK-NEXT: [[NARROW_SEL:%.*]] = select ninf i1 [[COND:%.*]], half [[TMP1]], half [[X]]
; CHECK-NEXT: [[NARROW_SEL:%.*]] = select i1 [[COND:%.*]], half [[TMP1]], half [[X]]
; CHECK-NEXT: ret half [[NARROW_SEL]]
;
%e = fpext half %x to float
Expand Down
15 changes: 7 additions & 8 deletions llvm/test/Transforms/InstCombine/known-never-nan.ll
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Expand Up @@ -20,10 +20,10 @@ define i1 @fabs_sqrt_src_maybe_nan(double %arg0, double %arg1) {

define i1 @select_maybe_nan_lhs(i1 %cond, double %lhs, double %arg1) {
; CHECK-LABEL: @select_maybe_nan_lhs(
; CHECK-NEXT: [[RHS:%.*]] = fadd nnan double [[ARG1:%.*]], 1.000000e+00
; CHECK-NEXT: [[OP:%.*]] = select i1 [[COND:%.*]], double [[LHS:%.*]], double [[RHS]]
; CHECK-NEXT: [[TMP:%.*]] = fcmp ord double [[OP]], 0.000000e+00
; CHECK-NEXT: ret i1 [[TMP]]
; CHECK-NEXT: [[TMP:%.*]] = fcmp ord double [[OP:%.*]], 0.000000e+00
; CHECK-NEXT: [[NOT_COND:%.*]] = xor i1 [[COND:%.*]], true
; CHECK-NEXT: [[TMP1:%.*]] = select i1 [[NOT_COND]], i1 true, i1 [[TMP]]
; CHECK-NEXT: ret i1 [[TMP1]]
;
%rhs = fadd nnan double %arg1, 1.0
%op = select i1 %cond, double %lhs, double %rhs
Expand All @@ -33,10 +33,9 @@ define i1 @select_maybe_nan_lhs(i1 %cond, double %lhs, double %arg1) {

define i1 @select_maybe_nan_rhs(i1 %cond, double %arg0, double %rhs) {
; CHECK-LABEL: @select_maybe_nan_rhs(
; CHECK-NEXT: [[LHS:%.*]] = fadd nnan double [[ARG0:%.*]], 1.000000e+00
; CHECK-NEXT: [[OP:%.*]] = select i1 [[COND:%.*]], double [[LHS]], double [[RHS:%.*]]
; CHECK-NEXT: [[TMP:%.*]] = fcmp ord double [[OP]], 0.000000e+00
; CHECK-NEXT: ret i1 [[TMP]]
; CHECK-NEXT: [[TMP:%.*]] = fcmp ord double [[OP:%.*]], 0.000000e+00
; CHECK-NEXT: [[TMP1:%.*]] = select i1 [[COND:%.*]], i1 true, i1 [[TMP]]
; CHECK-NEXT: ret i1 [[TMP1]]
;
%lhs = fadd nnan double %arg0, 1.0
%op = select i1 %cond, double %lhs, double %rhs
Expand Down
21 changes: 9 additions & 12 deletions llvm/test/Transforms/InstCombine/select.ll
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Expand Up @@ -4732,10 +4732,9 @@ define i32 @pr99436(ptr align 4 dereferenceable(4) %ptr) {

define i8 @sel_trunc_simplify(i1 %c, i8 %x, i16 %y) {
; CHECK-LABEL: @sel_trunc_simplify(
; CHECK-NEXT: [[X_EXT:%.*]] = zext i8 [[X:%.*]] to i16
; CHECK-NEXT: [[Y:%.*]] = select i1 [[C:%.*]], i16 [[X_EXT]], i16 [[Y1:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = trunc i16 [[Y]] to i8
; CHECK-NEXT: ret i8 [[TMP1]]
; CHECK-NEXT: [[TMP1:%.*]] = trunc i16 [[Y:%.*]] to i8
; CHECK-NEXT: [[TRUNC:%.*]] = select i1 [[C:%.*]], i8 [[X:%.*]], i8 [[TMP1]]
; CHECK-NEXT: ret i8 [[TRUNC]]
;
%x.ext = zext i8 %x to i16
%sel = select i1 %c, i16 %x.ext, i16 %y
Expand All @@ -4745,10 +4744,10 @@ define i8 @sel_trunc_simplify(i1 %c, i8 %x, i16 %y) {

define i32 @sel_umin_simplify(i1 %c, i32 %x, i16 %y) {
; CHECK-LABEL: @sel_umin_simplify(
; CHECK-NEXT: [[X:%.*]] = select i1 [[C:%.*]], i32 [[X1:%.*]], i32 0
; CHECK-NEXT: [[ARG2_EXT:%.*]] = zext i16 [[ARG2:%.*]] to i32
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @llvm.umin.i32(i32 [[X]], i32 [[ARG2_EXT]])
; CHECK-NEXT: ret i32 [[TMP1]]
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @llvm.umin.i32(i32 [[X:%.*]], i32 [[ARG2_EXT]])
; CHECK-NEXT: [[RES:%.*]] = select i1 [[C:%.*]], i32 [[TMP1]], i32 0
; CHECK-NEXT: ret i32 [[RES]]
;
%sel = select i1 %c, i32 %x, i32 0
%y.ext = zext i16 %y to i32
Expand All @@ -4758,11 +4757,9 @@ define i32 @sel_umin_simplify(i1 %c, i32 %x, i16 %y) {

define i32 @sel_extractvalue_simplify(i1 %c, { i32, i32 } %agg1, i32 %x, i32 %y) {
; CHECK-LABEL: @sel_extractvalue_simplify(
; CHECK-NEXT: [[AGG2_0:%.*]] = insertvalue { i32, i32 } poison, i32 [[X:%.*]], 0
; CHECK-NEXT: [[AGG2_1:%.*]] = insertvalue { i32, i32 } [[AGG2_0]], i32 [[Y:%.*]], 1
; CHECK-NEXT: [[AGG1:%.*]] = select i1 [[C:%.*]], { i32, i32 } [[AGG2:%.*]], { i32, i32 } [[AGG2_1]]
; CHECK-NEXT: [[TMP1:%.*]] = extractvalue { i32, i32 } [[AGG1]], 1
; CHECK-NEXT: ret i32 [[TMP1]]
; CHECK-NEXT: [[TMP1:%.*]] = extractvalue { i32, i32 } [[AGG1:%.*]], 1
; CHECK-NEXT: [[RES:%.*]] = select i1 [[C:%.*]], i32 [[TMP1]], i32 [[Y:%.*]]
; CHECK-NEXT: ret i32 [[RES]]
;
%agg2.0 = insertvalue { i32, i32 } poison, i32 %x, 0
%agg2.1 = insertvalue { i32, i32 } %agg2.0, i32 %y, 1
Expand Down
9 changes: 4 additions & 5 deletions llvm/test/Transforms/LoopVectorize/AArch64/deterministic-type-shrinkage.ll
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Expand Up @@ -393,7 +393,6 @@ define void @replicate_operands_in_with_operands_in_minbws(ptr %dst, ptr noalias
; CHECK-LABEL: define void @replicate_operands_in_with_operands_in_minbws
; CHECK-SAME: (ptr [[DST:%.*]], ptr noalias [[SRC_1:%.*]], ptr noalias [[SRC_2:%.*]], i32 [[X:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SUB:%.*]] = add i32 [[X]], 65526
; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
; CHECK: loop.header:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
Expand All @@ -405,10 +404,10 @@ define void @replicate_operands_in_with_operands_in_minbws(ptr %dst, ptr noalias
; CHECK-NEXT: [[GEP_SRC_2:%.*]] = getelementptr inbounds i16, ptr [[SRC_2]], i64 [[IV]]
; CHECK-NEXT: [[L_2:%.*]] = load i16, ptr [[GEP_SRC_2]], align 2
; CHECK-NEXT: [[C_2:%.*]] = icmp ult i16 [[L_2]], 100
; CHECK-NEXT: [[CONV:%.*]] = zext i16 [[L_2]] to i32
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[C_2]], i32 [[SUB]], i32 [[CONV]]
; CHECK-NEXT: [[TMP0:%.*]] = trunc i32 [[SEL]] to i16
; CHECK-NEXT: [[TRUNC:%.*]] = add i16 [[L_2]], [[TMP0]]
; CHECK-NEXT: [[TMP0:%.*]] = trunc i32 [[X]] to i16
; CHECK-NEXT: [[TMP1:%.*]] = add i16 [[TMP0]], -10
; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[C_2]], i16 [[TMP1]], i16 [[L_2]]
; CHECK-NEXT: [[TRUNC:%.*]] = add i16 [[TMP2]], [[L_2]]
; CHECK-NEXT: [[GEP_DST:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[IV]]
; CHECK-NEXT: store i16 [[TRUNC]], ptr [[GEP_DST]], align 2
; CHECK-NEXT: br label [[LOOP_LATCH]]
Expand Down
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