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* [glibc/maskray/grte] Add workaround to get clang to accept avx-512 instructions
@ 2021-08-27 23:22 Fangrui Song
  0 siblings, 0 replies; only message in thread
From: Fangrui Song @ 2021-08-27 23:22 UTC (permalink / raw)
  To: glibc-cvs

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6614ff3213ceaf3ac425e2d34cea5891b3d13c1b

commit 6614ff3213ceaf3ac425e2d34cea5891b3d13c1b
Author: Stan Shebs <stanshebs@google.com>
Date:   Wed Feb 7 12:57:16 2018 -0800

    Add workaround to get clang to accept avx-512 instructions

Diff:
---
 sysdeps/x86_64/Makefile | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sysdeps/x86_64/Makefile b/sysdeps/x86_64/Makefile
index 8148e12874..54e2ac7151 100644
--- a/sysdeps/x86_64/Makefile
+++ b/sysdeps/x86_64/Makefile
@@ -1,6 +1,13 @@
 # The i387 `long double' is a distinct type we support.
 long-double-fcts = yes
 
+ifeq ($(with-clang),yes)
+# Clang integrated assembler objects to AVX-512 instructions if not specifically
+# allowed. (-mavx512 is the preferred option but does not work in 5.0)
+ASFLAGS-.o += -march=knl
+ASFLAGS-.os += -march=knl
+endif
+
 ifeq ($(subdir),csu)
 gen-as-const-headers += link-defines.sym
 endif


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