[PATCH] D112142: [InstCombine][ConstantFolding] Make ConstantFoldLoadThroughBitcast TypeSize-aware
Peter Waller via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Oct 20 08:23:05 PDT 2021
peterwaller-arm created this revision.
peterwaller-arm added reviewers: david-arm, bsmith, paulwalker-arm.
Herald added a subscriber: hiraditya.
peterwaller-arm requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.
The newly added test previously caused the compiler to fail an
assertion. It looks like a strightforward TypeSize upgrade.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D112142
Files:
llvm/lib/Analysis/ConstantFolding.cpp
llvm/test/Transforms/InstCombine/vscale_load_bitcast.ll
Index: llvm/test/Transforms/InstCombine/vscale_load_bitcast.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/InstCombine/vscale_load_bitcast.ll
@@ -0,0 +1,13 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S -verify | FileCheck %s
+
+define <8 x i8> @constprop_load_bitcast() {
+; CHECK-LABEL: @constprop_load_bitcast(
+; CHECK-NEXT: ret <8 x i8> zeroinitializer
+;
+ %stack_var = alloca <vscale x 16 x i1>, align 16
+ store <vscale x 16 x i1> zeroinitializer, <vscale x 16 x i1>* %stack_var, align 16
+ %cast_to_fixed = bitcast <vscale x 16 x i1>* %stack_var to <8 x i8>*
+ %a = load <8 x i8>, <8 x i8>* %cast_to_fixed, align 16
+ ret <8 x i8> %a
+}
Index: llvm/lib/Analysis/ConstantFolding.cpp
===================================================================
--- llvm/lib/Analysis/ConstantFolding.cpp
+++ llvm/lib/Analysis/ConstantFolding.cpp
@@ -352,9 +352,9 @@
const DataLayout &DL) {
do {
Type *SrcTy = C->getType();
- uint64_t DestSize = DL.getTypeSizeInBits(DestTy);
- uint64_t SrcSize = DL.getTypeSizeInBits(SrcTy);
- if (SrcSize < DestSize)
+ TypeSize DestSize = DL.getTypeSizeInBits(DestTy);
+ TypeSize SrcSize = DL.getTypeSizeInBits(SrcTy);
+ if (TypeSize::isKnownLT(SrcSize, DestSize))
return nullptr;
// Catch the obvious splat cases (since all-zeros can coerce non-integral
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