[gcc(refs/vendors/ARM/heads/arm-struct-reorg-wip)] runtime: use 64 bits of hash seed on arm64

[Tamar Christina]

https://gcc.gnu.org/g:677ead3b349972bfa18fc87878dda4d3e87f6ddf

commit 677ead3b349972bfa18fc87878dda4d3e87f6ddf
Author: eric fang <eric.fang@arm.com>
Date:   Thu Feb 20 06:57:11 2020 +0000

    runtime: use 64 bits of hash seed on arm64
    
    This is the same issue as #33960, but on gofrontend.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/220297

Diff:
---
 gcc/go/gofrontend/MERGE |  2 +-
 libgo/runtime/aeshash.c | 12 ++++++------
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index 138425a19d2..7b382cf47b8 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-89fbf55a409d37ae898e5c4ea4250035f86bed1b
+0fe7a277c5d22265a73a4d216bd5d81799634453
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/libgo/runtime/aeshash.c b/libgo/runtime/aeshash.c
index 00658d7a896..93f28fd6125 100644
--- a/libgo/runtime/aeshash.c
+++ b/libgo/runtime/aeshash.c
@@ -596,7 +596,7 @@ uintptr aeshashbody(void* p, uintptr seed, uintptr size, Slice aeskeysched) {
 
 uintptr aeshashbody(void* p, uintptr seed, uintptr size, Slice aeskeysched) {
 	uint8x16_t *pseed;
-	uint32x4_t vinit32;
+	uint64x2_t vinit64;
 	uint8x16_t vinit;
 	uint8x16_t vseed, vseed2, vseed3, vseed4;
 	uint8x16_t vseed5, vseed6, vseed7, vseed8;
@@ -610,10 +610,10 @@ uintptr aeshashbody(void* p, uintptr seed, uintptr size, Slice aeskeysched) {
 	pseed = (uint8x16_t*)(aeskeysched.__values);
 
 	// Combined hash seed and length.
-	vinit32 = vdupq_n_u32(0);
-	vinit32[0] = (uint32)seed;
-	vinit32[1] = (uint32)size;
-	vinit = vreinterpretq_u8_u32(vinit32);
+	vinit64 = vdupq_n_u64(0);
+	vinit64[0] = (uint64)seed;
+	vinit64[1] = (uint64)size;
+	vinit = vreinterpretq_u8_u64(vinit64);
 
 	// Mix in per-process seed.
 	vseed = vaeseq_u8(*pseed, vinit);
@@ -626,7 +626,7 @@ uintptr aeshashbody(void* p, uintptr seed, uintptr size, Slice aeskeysched) {
 			// Return 64 bits of scrambled input seed.
 			return vreinterpretq_u64_u8(vseed)[0];
 		} else if (size < 16) {
-			vval = vreinterpretq_u8_u32(vdupq_n_u32(0));
+			vval = vreinterpretq_u8_u64(vdupq_n_u64(0));
 			if ((size & 8) != 0) {
 				vval = vreinterpretq_u8_u64(vld1q_lane_u64((uint64_t*)(p), vreinterpretq_u64_u8(vval), 0));
 				p = (void*)((uint64_t*)(p) + 1);