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
27 lines
1006 B
LLVM
27 lines
1006 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes=instcombine < %s | FileCheck %s
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@g = global [16 x i16] zeroinitializer
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define ptr @gep_constexpr_gv_1() {
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; CHECK-LABEL: @gep_constexpr_gv_1(
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; CHECK-NEXT: ret ptr getelementptr inbounds (i8, ptr @g, i64 20)
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;
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ret ptr getelementptr([16 x i16], ptr @g, i64 0, i64 10)
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}
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define ptr @gep_constexpr_gv_2() {
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; CHECK-LABEL: @gep_constexpr_gv_2(
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; CHECK-NEXT: ret ptr getelementptr inbounds (i8, ptr @g, i64 24)
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;
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ret ptr getelementptr(i32, ptr getelementptr([16 x i16], ptr @g, i64 0, i64 10), i64 1)
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}
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; Silly expression to get an inttoptr that does not combine with the GEP.
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define ptr @gep_constexpr_inttoptr() {
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; CHECK-LABEL: @gep_constexpr_inttoptr(
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; CHECK-NEXT: ret ptr getelementptr (i8, ptr inttoptr (i64 mul (i64 ptrtoint (ptr @g to i64), i64 2) to ptr), i64 20)
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;
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ret ptr getelementptr([16 x i16], ptr inttoptr (i64 mul (i64 ptrtoint (ptr @g to i64), i64 2) to ptr), i64 0, i64 10)
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}
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