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[Bug target/66917] [4.9/5/6 regression] ARM: NEON: memcpy compiles to vst1 with incorrect alignment due to SRA
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 30 Jul 2015 07:48:08 +0000
- Subject: [Bug target/66917] [4.9/5/6 regression] ARM: NEON: memcpy compiles to vst1 with incorrect alignment due to SRA
- Auto-submitted: auto-generated
- References: <bug-66917-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66917
--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Suggested fix:
Index: gcc/config/arm/arm.c
===================================================================
--- gcc/config/arm/arm.c (revision 226348)
+++ gcc/config/arm/arm.c (working copy)
@@ -27217,7 +27217,8 @@ arm_builtin_support_vector_misalignment
{
if (TARGET_NEON && !BYTES_BIG_ENDIAN && unaligned_access)
{
- HOST_WIDE_INT align = TYPE_ALIGN_UNIT (type);
+ HOST_WIDE_INT align
+ = GET_MODE_ALIGNMENT (TYPE_MODE (type)) / BITS_PER_UNIT;
if (is_packed)
return align == 1;
which produces
push {r4}
add r3, r0, #8
add r4, r1, #8
vld1.64 {d17}, [r1]
vld1.64 {d16}, [r4]
ldr r4, [sp], #4
vld1.64 {d19}, [r3]
veor d16, d16, d19
vld1.64 {d18}, [r0]
veor d17, d17, d18
vst1.64 {d17}, [r2]!
vst1.64 {d16}, [r2]
bx lr