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[ARM] In thumb mode, emit directive ".code 16" before file level inline

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assembly instructions.

This is necessary to ensure ARM assembler switches to Thumb mode before it
starts assembling the file level inline assembly instructions at the beginning
of a .s file.

<rdar://problem/17757232>



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213924 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2014-07-25 05:12:49 +00:00
parent b64f8426f2
commit 642c8bef19
2 changed files with 16 additions and 0 deletions
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3
lib/Target/ARM/ARMAsmPrinter.cpp
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@ -478,6 +478,9 @@ void ARMAsmPrinter::EmitStartOfAsmFile(Module &M) {
// Emit ARM Build Attributes
if (Subtarget->isTargetELF())
emitAttributes();
if (!M.getModuleInlineAsm().empty() && Subtarget->isThumb())
OutStreamer.EmitAssemblerFlag(MCAF_Code16);
}
static void

13
test/CodeGen/ARM/inlineasm-global.ll Normal file
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@ -0,0 +1,13 @@
; RUN: llc -march thumb -no-integrated-as %s -o - | FileCheck %s --check-prefix=THUMB
; RUN: llc -march arm -no-integrated-as %s -o - | FileCheck %s --check-prefix=ARM
; In thumb mode, emit ".code 16" before global inline-asm instructions.
; THUMB: .code 16
; THUMB: stmib
; THUMB: .code 16
; ARM-NOT: .code 16
; ARM: stmib
module asm "stmib sp, {r0-r14};"