| ; REQUIRES: asserts |
| ; 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 |
| ; |
| ; For Cortex-A53, shiftable operands that are not actually shifted |
| ; are not needed for an additional two cycles. |
| ; |
| ; CHECK: ********** MI Scheduling ********** |
| ; CHECK: shiftable |
| ; CHECK: SU(2): %2:gpr64common = SUBXri %1:gpr64common, 20, 0 |
| ; CHECK: Successors: |
| ; CHECK-NEXT: SU(4): Data Latency=1 Reg=%2 |
| ; CHECK-NEXT: SU(3): Data Latency=2 Reg=%2 |
| ; CHECK: ********** INTERVALS ********** |
| define i64 @shiftable(i64 %A, i64 %B) { |
| %tmp0 = sub i64 %B, 20 |
| %tmp1 = shl i64 %tmp0, 5; |
| %tmp2 = add i64 %A, %tmp1; |
| %tmp3 = add i64 %A, %tmp0 |
| %tmp4 = mul i64 %tmp2, %tmp3 |
| |
| ret i64 %tmp4 |
| } |
