[llvm] f4335f0 - [X86, AsmPrinter] Set assembler dialect for module inline asm
via llvm-commits
llvm-commits at lists.llvm.org
Fri Mar 15 09:38:11 PDT 2024
Author: Fangrui Song
Date: 2024-03-15T09:38:07-07:00
New Revision: f4335f075b3496bce6b49f9267e6160d1824b1bb
URL: https://github.com/llvm/llvm-project/commit/f4335f075b3496bce6b49f9267e6160d1824b1bb
DIFF: https://github.com/llvm/llvm-project/commit/f4335f075b3496bce6b49f9267e6160d1824b1bb.diff
LOG: [X86,AsmPrinter] Set assembler dialect for module inline asm
`clang -c -masm=intel` compiling a source file with file scope basic asm
incorrectly uses the AT&T dialect.
```
% cat a.c
asm("mov rax, rax");
% clang a.c -c -masm=intel
<inline asm>:1:1: error: unknown use of instruction mnemonic without a size suffix
mov rax, rax
^
```
Fix this by setting the assembler dialect from the MCAsmInfo object.
Note: `clang -c -flto -masm=intel a.c` still fails because of
https://reviews.llvm.org/D82862 for #34830: it tried to support AT&T
syntax for clang-cl, but the forced AT&T syntax is not compatible with
intended Intel syntax.
Pull Request: https://github.com/llvm/llvm-project/pull/85367
Added:
llvm/test/CodeGen/X86/asm-dialect-module.ll
Modified:
llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
Removed:
################################################################################
diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 0efe7a0e733672..a15538755d73b3 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -538,8 +538,10 @@ bool AsmPrinter::doInitialization(Module &M) {
if (!M.getModuleInlineAsm().empty()) {
OutStreamer->AddComment("Start of file scope inline assembly");
OutStreamer->addBlankLine();
- emitInlineAsm(M.getModuleInlineAsm() + "\n", *TM.getMCSubtargetInfo(),
- TM.Options.MCOptions);
+ emitInlineAsm(
+ M.getModuleInlineAsm() + "\n", *TM.getMCSubtargetInfo(),
+ TM.Options.MCOptions, nullptr,
+ InlineAsm::AsmDialect(TM.getMCAsmInfo()->getAssemblerDialect()));
OutStreamer->AddComment("End of file scope inline assembly");
OutStreamer->addBlankLine();
}
diff --git a/llvm/test/CodeGen/X86/asm-dialect-module.ll b/llvm/test/CodeGen/X86/asm-dialect-module.ll
new file mode 100644
index 00000000000000..2c00a44424c2c3
--- /dev/null
+++ b/llvm/test/CodeGen/X86/asm-dialect-module.ll
@@ -0,0 +1,10 @@
+;; Test that we respect the assembler dialect when parsing module-level inline asm.
+; RUN: not llc < %s -mtriple=x86_64 2>&1 | FileCheck %s --check-prefix=ERR
+; RUN: llc < %s -mtriple=x86_64 -x86-asm-syntax=intel | FileCheck %s
+
+; ERR: <inline asm>:1:1: error: unknown use of instruction mnemonic without a size suffix
+
+; CHECK: .intel_syntax noprefix
+; CHECK: mov eax, eax
+
+module asm "mov eax, eax"
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