1; REQUIRES: asserts 2; RUN: llc < %s -mtriple=arm64-linux-gnu -mcpu=cortex-a53 -pre-RA-sched=source -enable-misched -verify-misched -debug-only=machine-scheduler -o - 2>&1 > /dev/null | FileCheck %s 3; 4; For Cortex-A53, shiftable operands that are not actually shifted 5; are not needed for an additional two cycles. 6; 7; CHECK: ********** MI Scheduling ********** 8; CHECK: shiftable 9; CHECK: SU(2): %2:gpr64common = SUBXri %1:gpr64common, 20, 0 10; CHECK: Successors: 11; CHECK-NEXT: SU(4): Data Latency=1 Reg=%2 12; CHECK-NEXT: SU(3): Data Latency=2 Reg=%2 13; CHECK: ********** INTERVALS ********** 14define i64 @shiftable(i64 %A, i64 %B) { 15 %tmp0 = sub i64 %B, 20 16 %tmp1 = shl i64 %tmp0, 5; 17 %tmp2 = add i64 %A, %tmp1; 18 %tmp3 = add i64 %A, %tmp0 19 %tmp4 = mul i64 %tmp2, %tmp3 20 21 ret i64 %tmp4 22} 23