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[ARM] Emit ABI_PCS_R9_use build attribute. 

Patch by Ben Foster!

Differential Revision: http://reviews.llvm.org/D4657

llvm-svn: 213944
This commit is contained in:
Amara Emerson 2014-07-25 14:03:14 +00:00
parent 6819cf4974
commit 115d2df8a4
3 changed files with 22 additions and 0 deletions
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6
llvm/include/llvm/Support/ARMBuildAttributes.h
View File

@ -146,6 +146,12 @@ enum {
AllowNeon2 = 2, // SIMDv2 was permitted (Half-precision FP, MAC operations)
AllowNeonARMv8 = 3, // ARM v8-A SIMD was permitted
// Tag_ABI_PCS_R9_use, (=14), uleb128
R9IsGPR = 0, // R9 used as v6 (just another callee-saved register)
R9IsSB = 1, // R9 used as a global static base rgister
R9IsTLSPointer = 2, // R9 used as a thread local storage pointer
R9Reserved = 3, // R9 not used by code associated with attributed entity
// Tag_ABI_PCS_RW_data, (=15), uleb128
AddressRWPCRel = 1, // Address RW static data PC-relative
AddressRWSBRel = 2, // Address RW static data SB-relative

11
llvm/lib/Target/ARM/ARMAsmPrinter.cpp
View File

@ -760,6 +760,17 @@ void ARMAsmPrinter::emitAttributes() {
}
}
// TODO: We currently only support either reserving the register, or treating
// it as another callee-saved register, but not as SB or a TLS pointer; It
// would instead be nicer to push this from the frontend as metadata, as we do
// for the wchar and enum size tags
if (Subtarget->isR9Reserved())
ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_R9_use,
ARMBuildAttrs::R9Reserved);
else
ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_R9_use,
ARMBuildAttrs::R9IsGPR);
if (Subtarget->hasTrustZone() && Subtarget->hasVirtualization())
ATS.emitAttribute(ARMBuildAttrs::Virtualization_use,
ARMBuildAttrs::AllowTZVirtualization);

5
llvm/test/CodeGen/ARM/build-attributes.ll
View File

@ -38,6 +38,8 @@
; RUN: llc < %s -mtriple=arm-none-linux-gnueabi -relocation-model=default | FileCheck %s --check-prefix=RELOC-OTHER
; RUN: llc < %s -mtriple=arm-none-linux-gnueabi -relocation-model=dynamic-no-pic | FileCheck %s --check-prefix=RELOC-OTHER
; RUN: llc < %s -mtriple=arm-none-linux-gnueabi | FileCheck %s --check-prefix=RELOC-OTHER
; RUN: llc < %s -mtriple=arm-none-linux-gnueabi | FileCheck %s --check-prefix=PCS-R9-USE
; RUN: llc < %s -mtriple=arm-none-linux-gnueabi -arm-reserve-r9 | FileCheck %s --check-prefix=PCS-R9-RESERVE
; XSCALE: .eabi_attribute 6, 5
; XSCALE: .eabi_attribute 8, 1
@ -463,6 +465,9 @@
; RELOC-PIC: .eabi_attribute 17, 2
; RELOC-OTHER: .eabi_attribute 17, 1
; PCS-R9-USE: .eabi_attribute 14, 0
; PCS-R9-RESERVE: .eabi_attribute 14, 3
define i32 @f(i64 %z) {
ret i32 0
}