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Diffstat (limited to 'src/cmd/internal/obj/arm64/doc.go')
| -rw-r--r-- | src/cmd/internal/obj/arm64/doc.go | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/cmd/internal/obj/arm64/doc.go b/src/cmd/internal/obj/arm64/doc.go index 7515217544..efd4577f56 100644 --- a/src/cmd/internal/obj/arm64/doc.go +++ b/src/cmd/internal/obj/arm64/doc.go @@ -86,6 +86,16 @@ In the following example, PCALIGN at the entry of the function Add will align it MOVD $1, R1 RET +7. Move large constants to vector registers. + +Go asm uses VMOVQ/VMOVD/VMOVS to move 128-bit, 64-bit and 32-bit constants into vector registers, respectively. +And for a 128-bit interger, it take two 64-bit operands, for the high and low parts separately. + + Examples: + VMOVS $0x11223344, V0 + VMOVD $0x1122334455667788, V1 + VMOVQ $0x1122334455667788, $8877665544332211, V2 // V2=0x11223344556677888877665544332211 + Special Cases. (1) umov is written as VMOV. |