From fa04d488bd54b8fdd78cc9bcc6d90de4bf5f8efb Mon Sep 17 00:00:00 2001 From: fanzha02 Date: Wed, 16 Sep 2020 14:05:18 +0800 Subject: cmd/asm: fix the issue of moving 128-bit integers to vector registers on arm64 The CL 249758 added `FMOVQ $vcon, Vd` instruction and assembler used 128-bit simd literal-loading to load `$vcon` from pool into 128-bit vector register `Vd`. Because Go does not have 128-bit integers for now, the assembler will report an error of `immediate out of range` when assembleing `FMOVQ $0x123456789abcdef0123456789abcdef, V0` instruction. This patch lets 128-bit integers take two 64-bit operands, for the high and low parts separately and adds `VMOVQ $hi, $lo, Vd` instruction to move `$hi<<64+$lo' into 128-bit register `Vd`. In addition, this patch renames `FMOVQ/FMOVD/FMOVS` ops to 'VMOVQ/VMOVD/VMOVS' and uses them to move 128-bit, 64-bit and 32-bit constants into vector registers, respectively Update the go doc. Fixes #40725 Change-Id: Ia3c83bb6463f104d2bee960905053a97299e0a3a Reviewed-on: https://go-review.googlesource.com/c/go/+/255900 Trust: fannie zhang Reviewed-by: Cherry Zhang --- src/cmd/asm/internal/arch/arm64.go | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) (limited to 'src/cmd/asm/internal/arch') diff --git a/src/cmd/asm/internal/arch/arm64.go b/src/cmd/asm/internal/arch/arm64.go index 3817fcd5c2..e643889aef 100644 --- a/src/cmd/asm/internal/arch/arm64.go +++ b/src/cmd/asm/internal/arch/arm64.go @@ -82,6 +82,17 @@ func IsARM64STLXR(op obj.As) bool { return false } +// IsARM64TBL reports whether the op (as defined by an arm64.A* +// constant) is one of the TBL-like instructions and one of its +// inputs does not fit into prog.Reg, so require special handling. +func IsARM64TBL(op obj.As) bool { + switch op { + case arm64.AVTBL, arm64.AVMOVQ: + return true + } + return false +} + // ARM64Suffix handles the special suffix for the ARM64. // It returns a boolean to indicate success; failure means // cond was unrecognized. @@ -125,13 +136,6 @@ func arm64RegisterNumber(name string, n int16) (int16, bool) { return 0, false } -// IsARM64TBL reports whether the op (as defined by an arm64.A* -// constant) is one of the table lookup instructions that require special -// handling. -func IsARM64TBL(op obj.As) bool { - return op == arm64.AVTBL -} - // ARM64RegisterExtension parses an ARM64 register with extension or arrangement. func ARM64RegisterExtension(a *obj.Addr, ext string, reg, num int16, isAmount, isIndex bool) error { Rnum := (reg & 31) + int16(num<<5) -- cgit v1.3-6-g1900