It don't think it does. For instance, an int16 will be spilled to a 2-byte
slot in the stack frame.
Can you show us what you are seeing? This is what I tried:
package main
func f(p, q *int16) {
x := *p
y := *q
g()
*p = y
*q = x
}
func g()
go tool compile -S tmp.go
0x001d 00029 (tmp1.go:4) MOVQ "".p+24(SP), AX
0x0022 00034 (tmp1.go:4) MOVWLZX (AX), CX
0x0025 00037 (tmp1.go:4) MOVW CX, "".x+6(SP)
0x002a 00042 (tmp1.go:5) MOVQ "".q+32(SP), DX
0x002f 00047 (tmp1.go:5) MOVWLZX (DX), BX
0x0032 00050 (tmp1.go:5) MOVW BX, "".y+4(SP)
0x0037 00055 (tmp1.go:6) CALL "".g(SB)
0x003c 00060 (tmp1.go:7) MOVWLZX "".y+4(SP), AX
0x0041 00065 (tmp1.go:7) MOVQ "".p+24(SP), CX
0x0046 00070 (tmp1.go:7) MOVW AX, (CX)
0x0049 00073 (tmp1.go:8) MOVWLZX "".x+6(SP), AX
0x004e 00078 (tmp1.go:8) MOVQ "".q+32(SP), CX
0x0053 00083 (tmp1.go:8) MOVW AX, (CX)
On Monday, November 2, 2020 at 3:29:49 AM UTC-8 eric...@arm.com wrote:
> Hi,
>
> Can someone tell me why does OpStoreReg of type int16, int32, etc. occupy
> 8 bytes on the stack? And where is this handled ? Thanks.
>
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