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cc8987f5b5
If the pointer was loaded/stored before the null check, the check is redundant and can be removed. For now the optimizers do not remove the nullptr check, see https://gcc.godbolt.org/z/H2r5GG. The patch allows to use more nonnull constraints. Also, it found one more optimization in some PowerPC test. This is my first llvm review, I am free to any comments. Differential Revision: https://reviews.llvm.org/D71177
30 lines
1.0 KiB
LLVM
30 lines
1.0 KiB
LLVM
; RUN: llc -mcpu=pwr9 -mtriple=powerpc64le-unknown-linux-gnu < %s \
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; RUN: -verify-machineinstrs | FileCheck %s
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@b = dso_local local_unnamed_addr global i64* null, align 8
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@a = dso_local local_unnamed_addr global i8 0, align 1
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define void @testADDEPromoteResult() {
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entry:
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%0 = load i64*, i64** @b, align 8
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%1 = load i64, i64* %0, align 8
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%cmp = icmp ne i64* %0, null
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%conv1 = zext i1 %cmp to i64
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%add = add nsw i64 %1, %conv1
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%2 = trunc i64 %add to i8
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%conv2 = and i8 %2, 5
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store i8 %conv2, i8* @a, align 1
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ret void
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; CHECK-LABEL: @testADDEPromoteResult
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; CHECK: # %bb.0:
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; CHECK-DAG: addis [[REG1:[0-9]+]], [[REG2:[0-9]+]], [[VAR1:[a-z0-9A-Z_.]+]]@toc@ha
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; CHECK-DAG: ld [[REG3:[0-9]+]], [[VAR1]]@toc@l([[REG1]])
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; CHECK-DAG: lbz [[REG4:[0-9]+]], 0([[REG3]])
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; CHECK-DAG: addi [[REG7:[0-9]+]], [[REG4]]
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; CHECK-DAG: andi. [[REG9:[0-9]+]], [[REG7]], 5
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; CHECK-DAG: addis [[REG8:[0-9]+]], [[REG2]], [[VAR2:[a-z0-9A-Z_.]+]]@toc@ha
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; CHECK-DAG: stb [[REG9]], [[VAR2]]@toc@l([[REG8]])
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; CHECK: blr
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}
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