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[ARM] Emit correct build attributes for the relocation models. 

Patch by Asiri Rathnayake.

llvm-svn: 209656
This commit is contained in:
Amara Emerson 2014-05-27 13:30:21 +00:00
parent 10e06da031
commit ceeb1c4830
3 changed files with 37 additions and 0 deletions
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13
llvm/include/llvm/Support/ARMBuildAttributes.h
View File

@ -146,6 +146,19 @@ enum {
AllowNeon2 = 2, // SIMDv2 was permitted (Half-precision FP, MAC operations)
AllowNeonARMv8 = 3, // ARM v8-A SIMD was permitted
// Tag_ABI_PCS_RW_data, (=15), uleb128
AddressRWPCRel = 1, // Address RW static data PC-relative
AddressRWSBRel = 2, // Address RW static data SB-relative
AddressRWNone = 3, // No RW static data permitted
// Tag_ABI_PCS_RO_data, (=14), uleb128
AddressROPCRel = 1, // Address RO static data PC-relative
AddressRONone = 2, // No RO static data permitted
// Tag_ABI_PCS_GOT_use, (=17), uleb128
AddressDirect = 1, // Address imported data directly
AddressGOT = 2, // Address imported data indirectly (via GOT)
// Tag_ABI_FP_denormal, (=20), uleb128
PreserveFPSign = 2, // sign when flushed-to-zero is preserved

14
llvm/lib/Target/ARM/ARMAsmPrinter.cpp
View File

@ -671,6 +671,20 @@ void ARMAsmPrinter::emitAttributes() {
ATS.emitFPU(ARM::VFPV2);
}
if (TM.getRelocationModel() == Reloc::PIC_) {
// PIC specific attributes.
ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_RW_data,
ARMBuildAttrs::AddressRWPCRel);
ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_RO_data,
ARMBuildAttrs::AddressROPCRel);
ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_GOT_use,
ARMBuildAttrs::AddressGOT);
} else {
// Allow direct addressing of imported data for all other relocation models.
ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_GOT_use,
ARMBuildAttrs::AddressDirect);
}
// Signal various FP modes.
if (!TM.Options.UnsafeFPMath) {
ATS.emitAttribute(ARMBuildAttrs::ABI_FP_denormal, ARMBuildAttrs::Allowed);

10
llvm/test/CodeGen/ARM/build-attributes.ll
View File

@ -33,6 +33,11 @@
; RUN: llc < %s -mtriple=armv7-none-linux-gnueabi -mcpu=cortex-a7 -mattr=-vfp2,-vfp3,-vfp4,-neon | FileCheck %s --check-prefix=CORTEX-A7-NOFPU
; RUN: llc < %s -mtriple=armv7-none-linux-gnueabi -mcpu=cortex-a7 -mattr=+vfp4,-neon | FileCheck %s --check-prefix=CORTEX-A7-FPUV4
; RUN: llc < %s -mtriple=armv7-none-linux-gnueabi -mcpu=cortex-a7 -mattr=+vfp4,,+d16,-neon | FileCheck %s --check-prefix=CORTEX-A7-FPUV4
; RUN: llc < %s -mtriple=arm-none-linux-gnueabi -relocation-model=pic | FileCheck %s --check-prefix=RELOC-PIC
; RUN: llc < %s -mtriple=arm-none-linux-gnueabi -relocation-model=static | FileCheck %s --check-prefix=RELOC-OTHER
; 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
; XSCALE: .eabi_attribute 6, 5
; XSCALE: .eabi_attribute 8, 1
@ -453,6 +458,11 @@
; CORTEX-A57-NOT: .eabi_attribute 44
; CORTEX-A57: .eabi_attribute 68, 3
; RELOC-PIC: .eabi_attribute 15, 1
; RELOC-PIC: .eabi_attribute 16, 1
; RELOC-PIC: .eabi_attribute 17, 2
; RELOC-OTHER: .eabi_attribute 17, 1
define i32 @f(i64 %z) {
ret i32 0
}