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From d80b85dd61db9261b6cfd0d43a2f1c035627310b Mon Sep 17 00:00:00 2001
From: "Arsalan H. Awan" <Arsalan_Awan@mentor.com>
Date: Tue, 6 Apr 2021 15:01:41 +0500
Subject: [PATCH] x86_64/amd: avoid SSE register return with SSE disabled
When GRUB is compiled with -march=znver1 or -march=znver2 using the GCC
v9.3 and above, the compilation fails with the following error:
recipe-sysroot-native/usr/lib/x86_64-amd-linux/gcc/x86_64-amd-linux/
10.2.0/include/shaintrin.h:40:1:
error: SSE register return with SSE disabled
What's interesting, is that -march=skylake also implies -mbmi which
defines __BMI__ but compilation succeeds.
It is probably due to different BMI implementations on AMD and INTEL
processors and the way compiler uses related instructions.
Signed-off-by: Arsalan H. Awan <Arsalan_Awan@mentor.com>
---
configure.ac | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/configure.ac b/configure.ac
index 0b1bc48..dbe7a71 100644
--- a/configure.ac
+++ b/configure.ac
@@ -833,7 +833,7 @@ fi
if ( test "x$target_cpu" = xi386 || test "x$target_cpu" = xx86_64 ) && test "x$platform" != xemu; then
# Some toolchains enable these features by default, but they need
# registers that aren't set up properly in GRUB.
- TARGET_CFLAGS="$TARGET_CFLAGS -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow -mfpmath=387"
+ TARGET_CFLAGS="$TARGET_CFLAGS -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow -mfpmath=387 -mno-bmi"
fi
# GRUB doesn't use float or doubles at all. Yet some toolchains may decide
--
2.25.1
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