Skip to content

[AIX][AsmPrinter] Fix unsigned subtraction wrap-around #122214

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
hubert-reinterpretcast merged 1 commit into from
Jan 9, 2025
Merged

[AIX][AsmPrinter] Fix unsigned subtraction wrap-around #122214

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
27 changes: 14 additions & 13 deletions llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3914,21 +3914,22 @@ static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *CV,
if (isa<ConstantAggregateZero>(CV)) {
StructType *structType;
if (AliasList && (structType = llvm::dyn_cast<StructType>(CV->getType()))) {
// Handle cases of aliases to direct struct elements
const StructLayout *Layout = DL.getStructLayout(structType);
uint64_t SizeSoFar = 0;
for (unsigned int i = 0, n = structType->getNumElements(); i < n - 1;
++i) {
uint64_t GapToNext = Layout->getElementOffset(i + 1) - SizeSoFar;
AP.OutStreamer->emitZeros(GapToNext);
SizeSoFar += GapToNext;
emitGlobalAliasInline(AP, Offset + SizeSoFar, AliasList);
unsigned numElements = {structType->getNumElements()};
if (numElements != 0) {
// Handle cases of aliases to direct struct elements
const StructLayout *Layout = DL.getStructLayout(structType);
uint64_t SizeSoFar = 0;
for (unsigned int i = 0; i < numElements - 1; ++i) {
uint64_t GapToNext = Layout->getElementOffset(i + 1) - SizeSoFar;
AP.OutStreamer->emitZeros(GapToNext);
SizeSoFar += GapToNext;
emitGlobalAliasInline(AP, Offset + SizeSoFar, AliasList);
}
AP.OutStreamer->emitZeros(Size - SizeSoFar);
return;
}
AP.OutStreamer->emitZeros(Size - SizeSoFar);
return;
} else {
return AP.OutStreamer->emitZeros(Size);
}
return AP.OutStreamer->emitZeros(Size);
}

if (isa<UndefValue>(CV))
Expand Down
20 changes: 20 additions & 0 deletions llvm/test/CodeGen/PowerPC/global-merge-aix-zero-size-struct.ll
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
; RUN: llc -verify-machineinstrs -mtriple powerpc64-ibm-aix-xcoff -mcpu=pwr7 < %s | FileCheck %s

; RUN: llc -verify-machineinstrs -mtriple powerpc64-ibm-aix-xcoff -mcpu=pwr7 --filetype=obj -o %t.o < %s
; RUN: llvm-objdump --syms %t.o | FileCheck %s --check-prefix=OBJ

%struct.anon = type {}

@a = internal constant %struct.anon zeroinitializer, align 1
@b = internal constant [6 x i8] c"hello\00", align 1

; CHECK: .csect L.._MergedGlobals[RO],2
; CHECK-NEXT: .lglobl a # @_MergedGlobals
; CHECK-NEXT: .lglobl b
; CHECK-NEXT: a:
; CHECK-NEXT: b:
; CHECK-NEXT: .string "hello"

; OBJ: 0000000000000000 l .text 0000000000000006 L.._MergedGlobals
; OBJ-NEXT: 0000000000000000 l .text (csect: L.._MergedGlobals) 0000000000000000 a
; OBJ-NEXT: 0000000000000000 l .text (csect: L.._MergedGlobals) 0000000000000000 b
Loading