wrong code(armv6) generated for armv5

[kraj]

Bugzilla Link	28607
Resolution	FIXED
Resolved on	Aug 02, 2016 05:26
Version	3.9
OS	Linux
Blocks	#28974
Attachments	test case
CC	@rengolin

Extended Description

When attached program is compiled it generated ssat instruction which is armv6 instruction. Its not caught by internal assembler either. Only GNU assembler is able to flag it.

arm-oe-linux-musleabi-clang --sysroot=/mnt/oe/openembedded-core/build1/tmp-musl/sysroots/qemuarm -march=armv5e -marm -mlittle-endian -no-integrated-as a.c -c -O2

[kraj]

assigned to @rengolin

[kraj]

error message is

/tmp/kraj02/a-6653ef.s: Assembler messages:
/tmp/kraj02/a-6653ef.s:50: Error: selected processor does not support ssat r5,#16,r5 in ARM mode
clang-3.9: error: assembler command failed with exit code 1 (use -v to see invocation)

This is happening in few packages on Linux
gmp/alsa-lib/orc/mesa which are failing with exact same error. armv6 and armv7 works ok.

[kraj]

here are detailed error messages from packages

http://errors.yoctoproject.org/Errors/Build/18430/

[rengolin]

Hi Khem,

I'm not getting the SSAT instructions, can you provide the output of:

arm-oe-linux-musleabi-clang --sysroot=/mnt/oe/openembedded-core/build1/tmp-musl/sysroots/qemuarm -march=armv5e -marm -mlittle-endian -S -emit-llvm a.c -O2

thanks,
--renato

[rengolin]

Btw, the fix should be simple, regardless of you IR. I'm working on it.

[kraj]

I have able to reproduce it with

./tmp-musl/sysroots/x86_64-linux/usr/bin/clang -target armv5e-linux -march=armv5e -marm -mlittle-endian -no-integrated-as ~/a.c -S -O2

as well. The key is -no-integrated-as and -O2, I am on 3.9 branch as of yesterday.
but I have seen it on master too.

[kraj]

ll IR

[rengolin]

Should be fixed in r276701. This is simple and important enough to go back into 3.9. I'll back-port it.

[rengolin]

Backported to 3.9 branch, will appear in RC2.

[smithp35]

mentioned in issue llvm/llvm-bugzilla-archive#39947