Emit unaligned access build attribute for ARM

Patch by Charlie Turner.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219301 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp
index 5ae8b2f11ae5c11e77b5b9cd18221c328905ae58..f8e32634c74f3837a822a506774192b3cf466df5 100644 (file)
--- a/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -706,6 +706,13 @@ void ARMAsmPrinter::emitAttributes() {
     ATS.emitAttribute(ARMBuildAttrs::ABI_FP_number_model,
                       ARMBuildAttrs::AllowIEE754);
 
+  if (Subtarget->allowsUnalignedMem())
+    ATS.emitAttribute(ARMBuildAttrs::CPU_unaligned_access,
+                      ARMBuildAttrs::Allowed);
+  else
+    ATS.emitAttribute(ARMBuildAttrs::CPU_unaligned_access,
+                      ARMBuildAttrs::Not_Allowed);
+
   // FIXME: add more flags to ARMBuildAttributes.h
   // 8-bytes alignment stuff.
   ATS.emitAttribute(ARMBuildAttrs::ABI_align_needed, 1);

diff --git a/test/CodeGen/ARM/build-attributes.ll b/test/CodeGen/ARM/build-attributes.ll
index 4243fa4efbdd227e9cd6d64365b2ebe6062cfcd7..e72b269c0e0ce8c1b0a6e9690ae1dea80b62cd2f 100644 (file)
--- a/test/CodeGen/ARM/build-attributes.ll
+++ b/test/CodeGen/ARM/build-attributes.ll
@@ -44,6 +44,30 @@
 ; 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
 
+; ARMv8a (AArch32)
+; RUN: llc < %s -mtriple=armv8-none-linux-gnueabi -mcpu=cortex-a57 -arm-no-strict-align | FileCheck %s --check-prefix=NO-STRICT-ALIGN
+; RUN: llc < %s -mtriple=armv8-none-linux-gnueabi -mcpu=cortex-a57 -arm-strict-align | FileCheck %s --check-prefix=STRICT-ALIGN
+; ARMv7a
+; RUN: llc < %s -mtriple=armv7-none-linux-gnueabi -mcpu=cortex-a7 -arm-no-strict-align | FileCheck %s --check-prefix=NO-STRICT-ALIGN
+; RUN: llc < %s -mtriple=armv7-none-linux-gnueabi -mcpu=cortex-a7 -arm-strict-align | FileCheck %s --check-prefix=STRICT-ALIGN
+; ARMv7r
+; RUN: llc < %s -mtriple=armv7r-none-linux-gnueabi -mcpu=cortex-r5 -arm-no-strict-align | FileCheck %s --check-prefix=NO-STRICT-ALIGN
+; RUN: llc < %s -mtriple=armv7r-none-linux-gnueabi -mcpu=cortex-r5 -arm-strict-align | FileCheck %s --check-prefix=STRICT-ALIGN
+; ARMv7m
+; RUN: llc < %s -mtriple=thumbv7m-none-linux-gnueabi -mcpu=cortex-m3 -arm-no-strict-align | FileCheck %s --check-prefix=NO-STRICT-ALIGN
+; RUN: llc < %s -mtriple=thumbv7m-none-linux-gnueabi -mcpu=cortex-m3 -arm-strict-align | FileCheck %s --check-prefix=STRICT-ALIGN
+; ARMv6
+; RUN: llc < %s -mtriple=armv6-none-netbsd-gnueabi -mcpu=arm1136j-s | FileCheck %s --check-prefix=NO-STRICT-ALIGN
+; RUN: llc < %s -mtriple=armv6-none-linux-gnueabi -mcpu=arm1136j-s | FileCheck %s --check-prefix=STRICT-ALIGN
+; ARMv6m
+; RUN: llc < %s -mtriple=thumb-none-linux-gnueabi -arm-no-strict-align -mcpu=cortex-m0 | FileCheck %s --check-prefix=STRICT-ALIGN
+; RUN: llc < %s -mtriple=thumb-none-linux-gnueabi -arm-strict-align -mcpu=cortex-m0 | FileCheck %s --check-prefix=STRICT-ALIGN
+; RUN: llc < %s -mtriple=thumbv6m-none-linux-gnueabi -arm-no-strict-align | FileCheck %s --check-prefix=STRICT-ALIGN
+; RUN: llc < %s -mtriple=thumbv6m-none-linux-gnueabi -arm-strict-align | FileCheck %s --check-prefix=STRICT-ALIGN
+; ARMv5
+; RUN: llc < %s -mtriple=armv5-none-linux-gnueabi -mcpu=arm1022e -arm-no-strict-align | FileCheck %s --check-prefix=NO-STRICT-ALIGN
+; RUN: llc < %s -mtriple=armv5-none-linux-gnueabi -mcpu=arm1022e -arm-strict-align | FileCheck %s --check-prefix=STRICT-ALIGN
+
 ; XSCALE:      .eabi_attribute 6, 5
 ; XSCALE:      .eabi_attribute 8, 1
 ; XSCALE:      .eabi_attribute 9, 1
@@ -137,6 +161,10 @@
 ; V8-FPARMv8-NEON-CRYPTO: .fpu crypto-neon-fp-armv8
 ; V8-FPARMv8-NEON-CRYPTO: .eabi_attribute 12, 3
 
+; Tag_CPU_unaligned_access
+; NO-STRICT-ALIGN: .eabi_attribute 34, 1
+; STRICT-ALIGN: .eabi_attribute 34, 0
+
 ; Tag_CPU_arch 'ARMv7'
 ; CORTEX-A7-CHECK: .eabi_attribute     6, 10
 ; CORTEX-A7-NOFPU: .eabi_attribute     6, 10