#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/ValueLattice.h"
#include "llvm/Analysis/ValueLatticeUtils.h"
+#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/InstVisitor.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Debug.h"
void visitCastInst(CastInst &I);
void visitSelectInst(SelectInst &I);
void visitUnaryOperator(Instruction &I);
+ void visitFreezeInst(FreezeInst &I);
void visitBinaryOperator(Instruction &I);
void visitCmpInst(CmpInst &I);
void visitExtractValueInst(ExtractValueInst &EVI);
markOverdefined(&I);
}
+void SCCPInstVisitor::visitFreezeInst(FreezeInst &I) {
+ // If this freeze returns a struct, just mark the result overdefined.
+ // TODO: We could do a lot better than this.
+ if (I.getType()->isStructTy())
+ return (void)markOverdefined(&I);
+
+ ValueLatticeElement V0State = getValueState(I.getOperand(0));
+ ValueLatticeElement &IV = ValueState[&I];
+ // resolvedUndefsIn might mark I as overdefined. Bail out, even if we would
+ // discover a concrete value later.
+ if (SCCPSolver::isOverdefined(IV))
+ return (void)markOverdefined(&I);
+
+ // If something is unknown/undef, wait for it to resolve.
+ if (V0State.isUnknownOrUndef())
+ return;
+
+ if (SCCPSolver::isConstant(V0State) &&
+ isGuaranteedNotToBeUndefOrPoison(getConstant(V0State)))
+ return (void)markConstant(IV, &I, getConstant(V0State));
+
+ markOverdefined(&I);
+}
+
// Handle Binary Operators.
void SCCPInstVisitor::visitBinaryOperator(Instruction &I) {
ValueLatticeElement V1State = getValueState(I.getOperand(0));
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=ipsccp -S %s | FileCheck %s
+@g = global i64 0
declare void @use(i1)
define i1 @freeze_undef_i1() {
ret <2 x i32> %fr
}
+define i1 @freeze_const_i1() {
+; CHECK-LABEL: @freeze_const_i1(
+; CHECK-NEXT: ret i1 true
+;
+ %fr = freeze i1 1
+ ret i1 %fr
+}
+
+define ptr @freeze_const_ptr() {
+; CHECK-LABEL: @freeze_const_ptr(
+; CHECK-NEXT: ret ptr inttoptr (i32 256 to ptr)
+;
+ %fr = freeze ptr inttoptr (i32 256 to ptr)
+ ret ptr %fr
+}
+
+define float @freeze_const_float() {
+; CHECK-LABEL: @freeze_const_float(
+; CHECK-NEXT: ret float 2.500000e-01
+;
+ %fr = freeze float 2.500000e-01
+ ret float %fr
+}
+
+define <2 x i32> @freeze_const_vector() {
+; CHECK-LABEL: @freeze_const_vector(
+; CHECK-NEXT: ret <2 x i32> <i32 1, i32 2>
+;
+ %fr = freeze <2 x i32> <i32 1, i32 2>
+ ret <2 x i32> %fr
+}
+
+; make sure we don't constant-propagate values that could potentially be poison
+define i64 @maybe_poison() {
+; CHECK-LABEL: @maybe_poison(
+; CHECK-NEXT: [[FR:%.*]] = freeze i64 add nuw (i64 ptrtoint (ptr @g to i64), i64 123)
+; CHECK-NEXT: ret i64 [[FR]]
+;
+ %fr = freeze i64 add nuw (i64 ptrtoint (ptr @g to i64), i64 123)
+ ret i64 %fr
+}
+
+define {i64, i64} @freeze_struct({i64, i64} %s) {
+; CHECK-LABEL: @freeze_struct(
+; CHECK-NEXT: [[FR:%.*]] = freeze { i64, i64 } [[S:%.*]]
+; CHECK-NEXT: ret { i64, i64 } [[FR]]
+;
+ %fr = freeze {i64, i64} %s
+ ret {i64, i64} %fr
+}
+
define i1 @propagate_range_from_and_through_freeze(i32 %x, i32 %y) {
; CHECK-LABEL: @propagate_range_from_and_through_freeze(
; CHECK-NEXT: [[AND:%.*]] = and i32 [[X:%.*]], 3