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[ARM] ARMv6m and v8m.baseline strict align

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This sets target feature FeatureStrictAlign for Armv6-m and Armv8-m.baseline,
because it has no support for unaligned accesses.
It looks like we always pass target feature "+strict-align" from
Clang, so this is not a user facing problem, but querying the subtarget
(in e.g. llc) for unaligned access support is incorrect.

Differential Revision: https://reviews.llvm.org/D48437

llvm-svn: 335326
This commit is contained in:
Sjoerd Meijer 2018-06-22 08:48:13 +00:00
parent aa80fb9253
commit 129e526a8b
2 changed files with 15 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
lib/Target/ARM/ARM.td
View File

@ -526,13 +526,15 @@ def ARMv6m : Architecture<"armv6-m", "ARMv6m", [HasV6MOps,
FeatureNoARM,
ModeThumb,
FeatureDB,
FeatureMClass]>;
FeatureMClass,
FeatureStrictAlign]>;
def ARMv6sm : Architecture<"armv6s-m", "ARMv6sm", [HasV6MOps,
FeatureNoARM,
ModeThumb,
FeatureDB,
FeatureMClass]>;
FeatureMClass,
FeatureStrictAlign]>;
def ARMv7a : Architecture<"armv7-a", "ARMv7a", [HasV7Ops,
FeatureNEON,
@ -642,7 +644,8 @@ def ARMv8mBaseline : Architecture<"armv8-m.base", "ARMv8mBaseline",
FeatureV7Clrex,
Feature8MSecExt,
FeatureAcquireRelease,
FeatureMClass]>;
FeatureMClass,
FeatureStrictAlign]>;
def ARMv8mMainline : Architecture<"armv8-m.main", "ARMv8mMainline",
[HasV8MMainlineOps,

19
test/CodeGen/ARM/build-attributes.ll
View File

@ -73,13 +73,13 @@
; RUN: llc < %s -mtriple=armv7-linux-gnueabi -mattr=+neon,+fp16 | FileCheck %s --check-prefix=GENERIC-FPU-NEON-FP16
; RUN: llc < %s -mtriple=armv7-linux-gnueabi -mcpu=cortex-a17 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0 -mattr=+strict-align | FileCheck %s --check-prefix=CORTEX-M0
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0 -mattr=+strict-align -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M0-FAST
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0 -mattr=+strict-align -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0plus -mattr=+strict-align | FileCheck %s --check-prefix=CORTEX-M0PLUS
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0plus -mattr=+strict-align -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M0PLUS-FAST
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0plus -mattr=+strict-align -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m1 -mattr=+strict-align | FileCheck %s --check-prefix=CORTEX-M1
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0 | FileCheck %s --check-prefix=CORTEX-M0
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0 -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M0-FAST
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0 -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0plus | FileCheck %s --check-prefix=CORTEX-M0PLUS
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0plus -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M0PLUS-FAST
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m0plus -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m1 | FileCheck %s --check-prefix=CORTEX-M1
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m1 -mattr=+strict-align -enable-unsafe-fp-math -disable-fp-elim -enable-no-infs-fp-math -enable-no-nans-fp-math -fp-contract=fast | FileCheck %s --check-prefix=CORTEX-M1-FAST
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=cortex-m1 -mattr=+strict-align -enable-sign-dependent-rounding-fp-math | FileCheck %s --check-prefix=DYN-ROUNDING
; RUN: llc < %s -mtriple=thumbv6m-linux-gnueabi -mcpu=sc000 -mattr=+strict-align | FileCheck %s --check-prefix=SC000
@ -226,8 +226,7 @@
; RUN: llc < %s -mtriple=arm-none-none-eabi -mcpu=cortex-r52 | FileCheck %s --check-prefix=ARMv8R --check-prefix=ARMv8R-NEON
; ARMv8-M
; RUN: llc < %s -mtriple=thumbv8-none-none-eabi -mcpu=cortex-m23 | FileCheck %s --check-prefix=NO-STRICT-ALIGN
; RUN: llc < %s -mtriple=thumbv8-none-none-eabi -mcpu=cortex-m23 -mattr=+strict-align | FileCheck %s --check-prefix=STRICT-ALIGN
; RUN: llc < %s -mtriple=thumbv8-none-none-eabi -mcpu=cortex-m23 | FileCheck %s --check-prefix=STRICT-ALIGN
; RUN: llc < %s -mtriple=thumbv8-none-none-eabi -mcpu=cortex-m33 | FileCheck %s --check-prefix=NO-STRICT-ALIGN
; RUN: llc < %s -mtriple=thumbv8-none-none-eabi -mcpu=cortex-m33 -mattr=+strict-align | FileCheck %s --check-prefix=STRICT-ALIGN
@ -1355,7 +1354,7 @@
; CORTEX-M23: .eabi_attribute 8, 0
; CORTEX-M23: .eabi_attribute 9, 3
; CORTEX-M23-NOT: .eabi_attribute 27
; CORTEX-M23: .eabi_attribute 34, 1
; CORTEX-M23: .eabi_attribute 34, 0
; CORTEX-M23-NOT: .eabi_attribute 44
; CORTEX-M23: .eabi_attribute 17, 1
;; We default to IEEE 754 compliance