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a4fa0f747f
This reverts commit r337951.
While that kind of shared constant generally works fine in a MinGW
setting, it broke some cases of inline assembly that worked before:
$ cat const-asm.c
int MULH(int a, int b) {
int rt, dummy;
__asm__ (
"imull %3"
:"=d"(rt), "=a"(dummy)
:"a"(a), "rm"(b)
);
return rt;
}
int func(int a) {
return MULH(a, 1);
}
$ clang -target x86_64-win32-gnu -c const-asm.c -O2
const-asm.c:4:9: error: invalid variant '00000001'
"imull %3"
^
<inline asm>:1:15: note: instantiated into assembly here
imull __real@00000001(%rip)
^
A similar error is produced for i686 as well. The same test with a
target of x86_64-win32-msvc or i686-win32-msvc works fine.
llvm-svn: 338018
70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
//===- MCAsmInfoCOFF.cpp - COFF asm properties ----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines target asm properties related what form asm statements
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// should take in general on COFF-based targets
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCAsmInfoCOFF.h"
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#include "llvm/MC/MCDirectives.h"
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using namespace llvm;
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void MCAsmInfoCOFF::anchor() {}
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MCAsmInfoCOFF::MCAsmInfoCOFF() {
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// MingW 4.5 and later support .comm with log2 alignment, but .lcomm uses byte
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// alignment.
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COMMDirectiveAlignmentIsInBytes = false;
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LCOMMDirectiveAlignmentType = LCOMM::ByteAlignment;
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HasDotTypeDotSizeDirective = false;
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HasSingleParameterDotFile = false;
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WeakRefDirective = "\t.weak\t";
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HasLinkOnceDirective = true;
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// Doesn't support visibility:
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HiddenVisibilityAttr = HiddenDeclarationVisibilityAttr = MCSA_Invalid;
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ProtectedVisibilityAttr = MCSA_Invalid;
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// Set up DWARF directives
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SupportsDebugInformation = true;
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NeedsDwarfSectionOffsetDirective = true;
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UseIntegratedAssembler = true;
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// At least MSVC inline-asm does AShr.
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UseLogicalShr = false;
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// If this is a COFF target, assume that it supports associative comdats. It's
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// part of the spec.
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HasCOFFAssociativeComdats = true;
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// We can generate constants in comdat sections that can be shared,
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// but in order not to create null typed symbols, we actually need to
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// make them global symbols as well.
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HasCOFFComdatConstants = true;
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}
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void MCAsmInfoMicrosoft::anchor() {}
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MCAsmInfoMicrosoft::MCAsmInfoMicrosoft() = default;
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void MCAsmInfoGNUCOFF::anchor() {}
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MCAsmInfoGNUCOFF::MCAsmInfoGNUCOFF() {
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// If this is a GNU environment (mingw or cygwin), don't use associative
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// comdats for jump tables, unwind information, and other data associated with
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// a function.
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HasCOFFAssociativeComdats = false;
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// We don't create constants in comdat sections for MinGW.
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HasCOFFComdatConstants = false;
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}
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