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From: Adhemerval Zanella <>
Subject: [glibc] math: x86: Use prefix for FP_INIT_ROUNDMODE
Date: Mon,  5 Sep 2022 14:01:15 +0000 (GMT)	[thread overview]
Message-ID: <> (raw);h=2fc7320668ee843f9d1e5a2ec6c6fdbf00c735a3

commit 2fc7320668ee843f9d1e5a2ec6c6fdbf00c735a3
Author: Adhemerval Zanella <>
Date:   Thu Mar 10 14:48:44 2022 -0300

    math: x86: Use prefix for FP_INIT_ROUNDMODE
    Not all compilers support the inline asm prefix '%v' to emit the avx
    instruction if AVX is enable.  Use a prefix instead.
    Checked on x86_64-linux-gnu and i686-linux-gnu.

 sysdeps/x86/fpu/sfp-machine.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sysdeps/x86/fpu/sfp-machine.h b/sysdeps/x86/fpu/sfp-machine.h
index 5892f4f5fe..bc3fe332df 100644
--- a/sysdeps/x86/fpu/sfp-machine.h
+++ b/sysdeps/x86/fpu/sfp-machine.h
@@ -39,9 +39,15 @@ typedef unsigned int UTItype __attribute__ ((mode (TI)));
 # define FP_RND_MASK		0x6000
+# ifdef __AVX__
+#  define AVX_INSN_PREFIX	"v"
+# else
+#  define AVX_INSN_PREFIX	""
+# endif
 # define FP_INIT_ROUNDMODE					\
   do {								\
-    __asm__ __volatile__ ("%vstmxcsr\t%0" : "=m" (_fcw));	\
+    __asm__ __volatile__ (AVX_INSN_PREFIX "stmxcsr\t%0" : "=m" (_fcw)); \
   } while (0)
 # define _FP_W_TYPE_SIZE	32

                 reply	other threads:[~2022-09-05 14:01 UTC|newest]

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