fatal error: error in backend: Cannot select: intrinsic %llvm.x86.sse2.mfence

[llvmbot]

Bugzilla Link	23237
Resolution	FIXED
Resolved on	Sep 16, 2017 03:28
Version	trunk
OS	Linux
Blocks	#22065
Attachments	Preprocessed source, Run script
Reporter	LLVM Bugzilla Contributor
CC	@topperc,@RKSimon,@rnk

Extended Description

Using Building a coreboot [1] firmware image for an AGESA board like the ASRock E350M1, it fails with the following error.

Please note, that I needed to apply the patch with the work-around from bug 21538 [2] to get it past another error.

------ 8< ---- >8 ------
$ make
[…]
CC vendorcode/amd/agesa/f14/Lib/amdlib.libagesa.o
fatal error: error in backend: Cannot select: intrinsic %llvm.x86.sse2.mfence
clang: error: clang frontend command failed with exit code 70 (use -v to see invocation)
clang version 3.7.0 (http://llvm.org/git/clang.git 111e330648f7da9910029bf4e1bc4547dbd8f43f) (http://llvm.org/git/llvm.git 058309b)
Target: i386--linux-elf
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and associated run script.
clang: note: diagnostic msg:

---

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/amdlib-8ab3eb.c
clang: note: diagnostic msg: /tmp/amdlib-8ab3eb.sh
clang: note: diagnostic msg:

---

Makefile:250: recipe for target 'build/vendorcode/amd/agesa/f14/Lib/amdlib.libagesa.o' failed
make: *** [build/vendorcode/amd/agesa/f14/Lib/amdlib.libagesa.o] Error 70
------ 8< ---- >8 ------

Please find amdlib-8ab3eb.c attached.

[1] http://www.coreboot.org
[2] https://llvm.org/bugs/show_bug.cgi?id=21538

[llvmbot]

Let this bug also block bug 21691 ([META] Compiling the Coreboot with clang) [1].

[1] https://llvm.org/bugs/show_bug.cgi?id=21691

[rnk]

The -cc1 command enables SSE3 support ("-target-cpu" "k8-sse3"), so I would have expected this to work.

[topperc]

I suspect this occured because mmx was disabled which used to automaticall disable SSE. That was fixed in r249733. That looks to be after 3.7 released.