p.To.Type = obj.TYPE_REG
			p.To.Reg = REG_SP
			// Generate 'ADDQ $x, SP' or 'SUBQ $x, SP', with x positive.
			// One exception: It is smaller to encode $-0x80 than $0x80.
			// For that case, flip the sign and the op:
			// Instead of 'ADDQ $0x80, SP', generate 'SUBQ $-0x80, SP'.
			switch v := p.From.Offset; {
			case v == 0:
				p.As = obj.ANOP
			case v == 0x80 || (v < 0 && v != -0x80):

			var to string
			if cfg.BuildContext.GOOS == "windows" {
				to = filepath.Join(`\\_\_`, toPath)
			} else {
				to = filepath.Join("/_", toPath)
			}
			flags = append(slices.Clip(flags), prefixMapFlag+"="+from+"="+to)
		}
	}

	// Tell gcc to not insert truly random numbers into the build process
	// this ensures LTO won't create random numbers for symbols.