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[InstCombine] Handle logical and/or in assume optimization 

assume(a && b) can be converted to assume(a); assume(b) even if
the condition is logical. Same for assume(!(a || b)).
This commit is contained in:
Nikita Popov 2021-01-12 22:35:19 +01:00
parent 71ed4b6ce5
commit 23390e7a13
2 changed files with 5 additions and 5 deletions
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4
llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
View File

@ -1478,14 +1478,14 @@ Instruction *InstCombinerImpl::visitCallInst(CallInst &CI) {
FunctionType *AssumeIntrinsicTy = II->getFunctionType();
Value *AssumeIntrinsic = II->getCalledOperand();
Value *A, *B;
if (match(IIOperand, m_And(m_Value(A), m_Value(B)))) {
if (match(IIOperand, m_LogicalAnd(m_Value(A), m_Value(B)))) {
Builder.CreateCall(AssumeIntrinsicTy, AssumeIntrinsic, A, OpBundles,
II->getName());
Builder.CreateCall(AssumeIntrinsicTy, AssumeIntrinsic, B, II->getName());
return eraseInstFromFunction(*II);
}
// assume(!(a || b)) -> assume(!a); assume(!b);
if (match(IIOperand, m_Not(m_Or(m_Value(A), m_Value(B))))) {
if (match(IIOperand, m_Not(m_LogicalOr(m_Value(A), m_Value(B))))) {
Builder.CreateCall(AssumeIntrinsicTy, AssumeIntrinsic,
Builder.CreateNot(A), OpBundles, II->getName());
Builder.CreateCall(AssumeIntrinsicTy, AssumeIntrinsic,

6
llvm/test/Transforms/InstCombine/assume.ll
View File

@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S -instcombine-infinite-loop-threshold=2 | FileCheck %s
; RUN: opt < %s -instcombine -S -instcombine-infinite-loop-threshold=2 -instcombine-unsafe-select-transform=0 | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@ -627,7 +627,7 @@ define i32 @unreachable_assume_logical(i32 %x, i32 %y) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP0:%.*]] = icmp sgt i32 [[X:%.*]], 1
; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i32 [[Y:%.*]], 1
; CHECK-NEXT: [[OR:%.*]] = or i1 [[CMP0]], [[CMP1]]
; CHECK-NEXT: [[OR:%.*]] = select i1 [[CMP0]], i1 true, i1 [[CMP1]]
; CHECK-NEXT: tail call void @llvm.assume(i1 [[OR]])
; CHECK-NEXT: [[CMP2:%.*]] = icmp eq i32 [[X]], 1
; CHECK-NEXT: br i1 [[CMP2]], label [[IF:%.*]], label [[EXIT:%.*]]
@ -704,7 +704,7 @@ define i32 @unreachable_assumes_and_store_logical(i32 %x, i32 %y, i32* %p) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP0:%.*]] = icmp sgt i32 [[X:%.*]], 1
; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i32 [[Y:%.*]], 1
; CHECK-NEXT: [[OR:%.*]] = or i1 [[CMP0]], [[CMP1]]
; CHECK-NEXT: [[OR:%.*]] = select i1 [[CMP0]], i1 true, i1 [[CMP1]]
; CHECK-NEXT: tail call void @llvm.assume(i1 [[OR]])
; CHECK-NEXT: [[CMP2:%.*]] = icmp eq i32 [[X]], 1
; CHECK-NEXT: br i1 [[CMP2]], label [[IF:%.*]], label [[EXIT:%.*]]