8e8d2595da
This patch canonicalizes constant expression GEPs to use i8 source element type, aka ptradd. This is the ConstantFolding equivalent of the InstCombine canonicalization introduced in #68882. I believe all our optimizations working on constant expression GEPs (like GlobalOpt etc) have already been switched to work on offsets, so I don't expect any significant fallout from this change. This is part of: https://discourse.llvm.org/t/rfc-replacing-getelementptr-with-ptradd/68699
31 lines
1.0 KiB
LLVM
31 lines
1.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=newgvn -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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%rec11 = type { i16, i16, i16 }
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@str = global %rec11 { i16 1, i16 2, i16 3 }
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;; Test that we forward the first store to the second load
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define i16 @bazinga() {
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; CHECK-LABEL: @bazinga(
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; CHECK-NEXT: [[_TMP10:%.*]] = load i16, ptr getelementptr inbounds (i8, ptr @str, i64 2), align 2
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; CHECK-NEXT: store i16 [[_TMP10]], ptr @str, align 2
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; CHECK-NEXT: [[_TMP15:%.*]] = icmp eq i16 [[_TMP10]], 3
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; CHECK-NEXT: [[_TMP16:%.*]] = select i1 [[_TMP15]], i16 1, i16 0
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; CHECK-NEXT: br label [[BB1:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: ret i16 [[_TMP16]]
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;
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%_tmp9 = getelementptr %rec11, ptr @str, i16 0, i32 1
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%_tmp10 = load i16, ptr %_tmp9
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store i16 %_tmp10, ptr @str
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%_tmp14 = load i16, ptr @str
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%_tmp15 = icmp eq i16 %_tmp14, 3
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%_tmp16 = select i1 %_tmp15, i16 1, i16 0
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br label %bb1
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bb1:
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ret i16 %_tmp16
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}
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