| ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py |
| ; RUN: llc -mtriple=arm-eabi %s -o - | FileCheck %s |
| ; RUN: llc -mtriple=armv6m-eabi %s -o - | FileCheck %s --check-prefix=EXPAND |
| |
| define i64 @test_shl(i64 %val, i64 %amt) { |
| ; CHECK-LABEL: test_shl: |
| ; CHECK: @ %bb.0: |
| ; CHECK-NEXT: rsb r3, r2, #32 |
| ; CHECK-NEXT: lsr r3, r0, r3 |
| ; CHECK-NEXT: orr r1, r3, r1, lsl r2 |
| ; CHECK-NEXT: subs r3, r2, #32 |
| ; CHECK-NEXT: lslpl r1, r0, r3 |
| ; CHECK-NEXT: lsl r0, r0, r2 |
| ; CHECK-NEXT: movpl r0, #0 |
| ; CHECK-NEXT: mov pc, lr |
| ; |
| ; EXPAND-LABEL: test_shl: |
| ; EXPAND: @ %bb.0: |
| ; EXPAND-NEXT: .save {r7, lr} |
| ; EXPAND-NEXT: push {r7, lr} |
| ; EXPAND-NEXT: bl __aeabi_llsl |
| ; EXPAND-NEXT: pop {r7, pc} |
| %res = shl i64 %val, %amt |
| ret i64 %res |
| } |
| |
| ; Explanation for lshr is pretty much the reverse of shl. |
| define i64 @test_lshr(i64 %val, i64 %amt) { |
| ; CHECK-LABEL: test_lshr: |
| ; CHECK: @ %bb.0: |
| ; CHECK-NEXT: rsb r3, r2, #32 |
| ; CHECK-NEXT: lsr r0, r0, r2 |
| ; CHECK-NEXT: orr r0, r0, r1, lsl r3 |
| ; CHECK-NEXT: subs r3, r2, #32 |
| ; CHECK-NEXT: lsrpl r0, r1, r3 |
| ; CHECK-NEXT: lsr r1, r1, r2 |
| ; CHECK-NEXT: movpl r1, #0 |
| ; CHECK-NEXT: mov pc, lr |
| ; |
| ; EXPAND-LABEL: test_lshr: |
| ; EXPAND: @ %bb.0: |
| ; EXPAND-NEXT: .save {r7, lr} |
| ; EXPAND-NEXT: push {r7, lr} |
| ; EXPAND-NEXT: bl __aeabi_llsr |
| ; EXPAND-NEXT: pop {r7, pc} |
| %res = lshr i64 %val, %amt |
| ret i64 %res |
| } |
| |
| ; One minor difference for ashr: the high bits must be "hi >> 31" if the shift |
| ; amount is large to get the right sign bit. |
| define i64 @test_ashr(i64 %val, i64 %amt) { |
| ; CHECK-LABEL: test_ashr: |
| ; CHECK: @ %bb.0: |
| ; CHECK-NEXT: asr r3, r1, r2 |
| ; CHECK-NEXT: subs r12, r2, #32 |
| ; CHECK-NEXT: lsr r0, r0, r2 |
| ; CHECK-NEXT: rsb r2, r2, #32 |
| ; CHECK-NEXT: asrpl r3, r1, #31 |
| ; CHECK-NEXT: orr r0, r0, r1, lsl r2 |
| ; CHECK-NEXT: asrpl r0, r1, r12 |
| ; CHECK-NEXT: mov r1, r3 |
| ; CHECK-NEXT: mov pc, lr |
| ; |
| ; EXPAND-LABEL: test_ashr: |
| ; EXPAND: @ %bb.0: |
| ; EXPAND-NEXT: .save {r7, lr} |
| ; EXPAND-NEXT: push {r7, lr} |
| ; EXPAND-NEXT: bl __aeabi_lasr |
| ; EXPAND-NEXT: pop {r7, pc} |
| %res = ashr i64 %val, %amt |
| ret i64 %res |
| } |