[araki@Arakis-MBP No Backup]$ diff main3.txt main4.txt 35c35 < movl $3, %edi --- > movl $4, %edi 37c37 < movq $3, 16(%rax) --- > movq $4, 16(%rax) 40,41c40 < movabsq $4607182418800017408, %rcx < movq %rcx, 48(%rax) --- > movupd %xmm0, 48(%rax)[araki@Arakis-MBP No Backup]$ cat main.swift var rgb = [Double](repeating: 1, count: 3) let scalar: Double = 0.99 rgb.withUnsafeMutableBufferPointer { var p = $0.baseAddress! for _ in 0..<$0.count { p.pointee *= scalar p += 1 } } [araki@Arakis-MBP No Backup]$ swiftc -emit-assembly -O main.swift > main3.txt