[ARM] Add support for armv7e-m to the .arch directive

This will allow compilation of assembly files targeting armv7e-m without having
to specify the Tag_CPU_arch attribute as a workaround.

Differential revision: https://reviews.llvm.org/D40370

Patch by Ian Tessier!

llvm-svn: 319303

4 files changed, 70 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
index 8cfa18f58b6..d465da1a7bb 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
@@ -847,6 +847,7 @@ void ARMTargetELFStreamer::emitArchDefaultAttributes() {
     setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
     break;
 
+  case ARM::ArchKind::ARMV7EM:
   case ARM::ArchKind::ARMV7M:
     setAttributeItem(CPU_arch_profile, MicroControllerProfile, false);
     setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
diff --git a/llvm/test/CodeGen/ARM/build-attributes.ll b/llvm/test/CodeGen/ARM/build-attributes.ll
index bef7bbe01bf..a84bc9deecd 100644
--- a/llvm/test/CodeGen/ARM/build-attributes.ll
+++ b/llvm/test/CodeGen/ARM/build-attributes.ll
@@ -191,6 +191,9 @@
 ; ARMv7r
 ; RUN: llc < %s -mtriple=armv7r-none-linux-gnueabi -mcpu=cortex-r5 | FileCheck %s --check-prefix=NO-STRICT-ALIGN
 ; RUN: llc < %s -mtriple=armv7r-none-linux-gnueabi -mcpu=cortex-r5 -mattr=+strict-align | FileCheck %s --check-prefix=STRICT-ALIGN
+; ARMv7em
+; RUN: llc < %s -mtriple=thumbv7em-none-linux-gnueabi -mcpu=cortex-m4 | FileCheck %s --check-prefix=NO-STRICT-ALIGN
+; RUN: llc < %s -mtriple=thumbv7em-none-linux-gnueabi -mcpu=cortex-m4 -mattr=+strict-align | FileCheck %s --check-prefix=STRICT-ALIGN
 ; ARMv7m
 ; RUN: llc < %s -mtriple=thumbv7m-none-linux-gnueabi -mcpu=cortex-m3 | FileCheck %s --check-prefix=NO-STRICT-ALIGN
 ; RUN: llc < %s -mtriple=thumbv7m-none-linux-gnueabi -mcpu=cortex-m3 -mattr=+strict-align | FileCheck %s --check-prefix=STRICT-ALIGN
diff --git a/llvm/test/MC/ARM/directive-arch-armv7e-m.s b/llvm/test/MC/ARM/directive-arch-armv7e-m.s
new file mode 100644
index 00000000000..f7c5d67b8fe
--- /dev/null
+++ b/llvm/test/MC/ARM/directive-arch-armv7e-m.s
@@ -0,0 +1,33 @@
+@ Test the .arch directive for armv7e-m
+
+@ This test case will check the default .ARM.attributes value for the
+@ armv7e-m architecture.
+
+@ RUN: llvm-mc -triple arm-eabi -filetype asm %s \
+@ RUN:   | FileCheck %s -check-prefix CHECK-ASM
+@ RUN: llvm-mc -triple arm-eabi -filetype obj %s \
+@ RUN:   | llvm-readobj -arm-attributes | FileCheck %s -check-prefix CHECK-ATTR
+
+  .syntax  unified
+  .arch  armv7e-m
+
+@ CHECK-ASM:   .arch  armv7e-m
+
+@ CHECK-ATTR: FileAttributes {
+@ CHECK-ATTR:   Attribute {
+@ CHECK-ATTR:     TagName: CPU_name
+@ CHECK-ATTR:     Value: 7E-M
+@ CHECK-ATTR:   }
+@ CHECK-ATTR:   Attribute {
+@ CHECK-ATTR:     TagName: CPU_arch
+@ CHECK-ATTR:     Description: ARM v7
+@ CHECK-ATTR:   }
+@ CHECK-ATTR:   Attribute {
+@ CHECK-ATTR:     TagName: CPU_arch_profile
+@ CHECK-ATTR:     Description: Microcontroller
+@ CHECK-ATTR:   }
+@ CHECK-ATTR:   Attribute {
+@ CHECK-ATTR:     TagName: THUMB_ISA_use
+@ CHECK-ATTR:     Description: Thumb-2
+@ CHECK-ATTR:   }
+@ CHECK-ATTR: }
diff --git a/llvm/test/MC/ARM/directive-arch-armv7em.s b/llvm/test/MC/ARM/directive-arch-armv7em.s
new file mode 100644
index 00000000000..f37398106de
--- /dev/null
+++ b/llvm/test/MC/ARM/directive-arch-armv7em.s
@@ -0,0 +1,33 @@
+@ Test the .arch directive for armv7e-m
+
+@ This test case will check the default .ARM.attributes value for the
+@ armv7e-m architecture when using the armv7em alias.
+
+@ RUN: llvm-mc -triple arm-eabi -filetype asm %s \
+@ RUN:   | FileCheck %s -check-prefix CHECK-ASM
+@ RUN: llvm-mc -triple arm-eabi -filetype obj %s \
+@ RUN:   | llvm-readobj -arm-attributes | FileCheck %s -check-prefix CHECK-ATTR
+
+  .syntax  unified
+  .arch  armv7em
+
+@ CHECK-ASM:   .arch  armv7e-m
+
+@ CHECK-ATTR: FileAttributes {
+@ CHECK-ATTR:   Attribute {
+@ CHECK-ATTR:     TagName: CPU_name
+@ CHECK-ATTR:     Value: 7E-M
+@ CHECK-ATTR:   }
+@ CHECK-ATTR:   Attribute {
+@ CHECK-ATTR:     TagName: CPU_arch
+@ CHECK-ATTR:     Description: ARM v7
+@ CHECK-ATTR:   }
+@ CHECK-ATTR:   Attribute {
+@ CHECK-ATTR:     TagName: CPU_arch_profile
+@ CHECK-ATTR:     Description: Microcontroller
+@ CHECK-ATTR:   }
+@ CHECK-ATTR:   Attribute {
+@ CHECK-ATTR:     TagName: THUMB_ISA_use
+@ CHECK-ATTR:     Description: Thumb-2
+@ CHECK-ATTR:   }
+@ CHECK-ATTR: }