[PATCH] D43734: [RecordLayout] Don't align to non-power-of-2 sizes when using -mms-bitfields
Martin Storsjö via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Mon Feb 26 22:29:17 PST 2018
This revision was automatically updated to reflect the committed changes.
Closed by commit rL326173: [RecordLayout] Don't align to non-power-of-2 sizes when using -mms-bitfields (authored by mstorsjo, committed by ).
Herald added a subscriber: llvm-commits.
Changed prior to commit:
https://reviews.llvm.org/D43734?vs=135813&id=136037#toc
Repository:
rL LLVM
https://reviews.llvm.org/D43734
Files:
cfe/trunk/lib/AST/RecordLayoutBuilder.cpp
cfe/trunk/test/CodeGen/mingw-long-double.c
Index: cfe/trunk/test/CodeGen/mingw-long-double.c
===================================================================
--- cfe/trunk/test/CodeGen/mingw-long-double.c
+++ cfe/trunk/test/CodeGen/mingw-long-double.c
@@ -1,5 +1,7 @@
// RUN: %clang_cc1 -triple i686-windows-gnu -emit-llvm -o - %s \
// RUN: | FileCheck %s --check-prefix=GNU32
+// RUN: %clang_cc1 -triple i686-windows-gnu -emit-llvm -o - %s -mms-bitfields \
+// RUN: | FileCheck %s --check-prefix=GNU32
// RUN: %clang_cc1 -triple x86_64-windows-gnu -emit-llvm -o - %s \
// RUN: | FileCheck %s --check-prefix=GNU64
// RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm -o - %s \
Index: cfe/trunk/lib/AST/RecordLayoutBuilder.cpp
===================================================================
--- cfe/trunk/lib/AST/RecordLayoutBuilder.cpp
+++ cfe/trunk/lib/AST/RecordLayoutBuilder.cpp
@@ -1752,7 +1752,12 @@
QualType T = Context.getBaseElementType(D->getType());
if (const BuiltinType *BTy = T->getAs<BuiltinType>()) {
CharUnits TypeSize = Context.getTypeSizeInChars(BTy);
- if (TypeSize > FieldAlign)
+ assert(
+ (llvm::isPowerOf2_64(TypeSize.getQuantity()) ||
+ Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) &&
+ "Non PowerOf2 size outside of GNU mode");
+ if (TypeSize > FieldAlign &&
+ llvm::isPowerOf2_64(TypeSize.getQuantity()))
FieldAlign = TypeSize;
}
}
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