feat(amd64): encode the mixed-width extend family and PMOVMSKB

Assisted-by: GLM 5.3
2026-09-20 00:38:24 +02:00
parent d315a998ce
commit 187e4856d3
5 changed files with 105 additions and 14 deletions
@@ -0,0 +1,39 @@
+// Mixed-width sign- and zero-extending moves plus PMOVMSKB, the spellings
+// GOROOT's runtime and bytealg kernels use.  Every result is folded back so
+// no instruction is dead.
+
+#include "textflag.h"
+
+// func widen(p *byte) uint64
+TEXT ·widen(SB), NOSPLIT, $0-16
+	MOVBQZX 0(DI), AX
+	MOVWQZX 2(DI), CX
+	ADDQ    CX, AX
+	MOVLQZX 4(DI), DX
+	ADDQ    DX, AX
+	MOVBQSX 8(DI), R8
+	ADDQ    R8, AX
+	MOVWQSX 12(DI), R9
+	ADDQ    R9, AX
+	MOVBLSX 16(DI), R10
+	ADDL    R10, AX
+	MOVLQSX 20(DI), R11
+	ADDQ    R11, AX
+	MOVQ    AX, ret+8(FP)
+	RET
+
+// func widenw(p *byte) int32
+TEXT ·widenw(SB), NOSPLIT, $0-16
+	MOVBWZX 0(DI), AX
+	MOVBWSX 1(DI), CX
+	ADDL    CX, AX
+	MOVLQZX AX, DX
+	MOVL    DX, ret+8(FP)
+	RET
+
+// func mask(x *XMM) int
+TEXT ·mask(SB), NOSPLIT, $0-16
+	MOVOU    0(DI), X1
+	PMOVMSKB X1, AX
+	MOVQ     AX, ret+8(FP)
+	RET