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guix: replace GCC unaligned VMOV patch with binutils patch

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Rather than invasively patching GCC. Given we have binutils 2.38
available, we can patch it to flip the default for
`-muse-unaligned-vector-move`.
This commit is contained in:
fanquake
2024-04-10 12:21:22 +02:00
parent 3f6a6da3b0
commit a0dc2ebcda
3 changed files with 28 additions and 291 deletions
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22
contrib/guix/patches/binutils-unaligned-default.patch Normal file
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@@ -0,0 +1,22 @@
commit 6537181f59ed186a341db621812a6bc35e22eaf6
Author: fanquake <fanquake@gmail.com>
Date: Wed Apr 10 12:15:52 2024 +0200
build: turn on -muse-unaligned-vector-move by default
This allows us to avoid (more invasively) patching GCC, to avoid
unaligned instruction use.
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index e0632681477..14a9653abdf 100644
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -801,7 +801,7 @@ static unsigned int no_cond_jump_promotion = 0;
static unsigned int sse2avx;
/* Encode aligned vector move as unaligned vector move. */
-static unsigned int use_unaligned_vector_move;
+static unsigned int use_unaligned_vector_move = 1;
/* Encode scalar AVX instructions with specific vector length. */
static enum