https://github.com/tru updated https://github.com/llvm/llvm-project/pull/101938
>From 91d3e76a2b670aece2a15c54f3f9893c0ed96ba1 Mon Sep 17 00:00:00 2001
From: Kerry McLaughlin <kerry.mclaugh...@arm.com>
Date: Fri, 2 Aug 2024 18:00:59 +0100
Subject: [PATCH] [AArch64][SME] Rewrite __arm_sc_memset to remove invalid
instruction (#101522)
The implementation of __arm_sc_memset in compiler-rt contains
a Neon dup instruction which is not valid in streaming mode. This
patch rewrites the function, using an SVE mov instruction if available.
(cherry picked from commit d6649f2d4871c4535ae0519920e36100748890c4)
---
.../lib/builtins/aarch64/sme-libc-mem-routines.S | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/compiler-rt/lib/builtins/aarch64/sme-libc-mem-routines.S
b/compiler-rt/lib/builtins/aarch64/sme-libc-mem-routines.S
index 926ad3b1b63315..0318d9a6f1ebd2 100644
--- a/compiler-rt/lib/builtins/aarch64/sme-libc-mem-routines.S
+++ b/compiler-rt/lib/builtins/aarch64/sme-libc-mem-routines.S
@@ -252,7 +252,15 @@ DEFINE_COMPILERRT_FUNCTION_ALIAS(__arm_sc_memmove,
__arm_sc_memcpy)
#define zva_val x5
DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(__arm_sc_memset)
- dup v0.16B, valw
+#ifdef __ARM_FEATURE_SVE
+ mov z0.b, valw
+#else
+ bfi valw, valw, #8, #8
+ bfi valw, valw, #16, #16
+ bfi val, val, #32, #32
+ fmov d0, val
+ fmov v0.d[1], val
+#endif
add dstend2, dstin, count
cmp count, 96
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