| ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py |
| ; RUN: llc -mtriple=riscv64 -mattr=+m -verify-machineinstrs < %s | FileCheck %s |
| |
| ; This test has multiple opportunities for SimplifyDemandedBits after type |
| ; legalization. There are 2 opportunities on the chain feeding the LHS of the |
| ; shl. And one opportunity on the shift amount. We previously weren't managing |
| ; the DAGCombiner worklist correctly and failed to get the RHS. |
| define i32 @foo(i32 %x, i32 %y, i32 %z) { |
| ; CHECK-LABEL: foo: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: mulw a0, a0, a0 |
| ; CHECK-NEXT: addiw a0, a0, 1 |
| ; CHECK-NEXT: mulw a0, a0, a0 |
| ; CHECK-NEXT: addw a0, a0, a2 |
| ; CHECK-NEXT: addiw a0, a0, 1 |
| ; CHECK-NEXT: sllw a0, a0, a1 |
| ; CHECK-NEXT: ret |
| %b = mul i32 %x, %x |
| %c = add i32 %b, 1 |
| %d = mul i32 %c, %c |
| %e = add i32 %d, %z |
| %f = add i32 %e, 1 |
| %g = shl i32 %f, %y |
| ret i32 %g |
| } |
| |
| ; The sign bit of an nsw self multiply is 0. Make sure we can use this to |
| ; convert the AND constant to -8. |
| define i64 @mul_self_nsw_sign(i64 %x) { |
| ; CHECK-LABEL: mul_self_nsw_sign: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: mul a0, a0, a0 |
| ; CHECK-NEXT: andi a0, a0, -8 |
| ; CHECK-NEXT: ret |
| %a = mul nsw i64 %x, %x |
| %b = and i64 %a, 9223372036854775800 |
| ret i64 %b |
| } |
| |
| ; Make sure we sign extend the constant after type legalization to allow the |
| ; use of ori. |
| define void @ori(ptr nocapture noundef %0) { |
| ; CHECK-LABEL: ori: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: lw a1, 0(a0) |
| ; CHECK-NEXT: ori a1, a1, -2 |
| ; CHECK-NEXT: sw a1, 0(a0) |
| ; CHECK-NEXT: ret |
| %2 = load i32, ptr %0, align 4 |
| %3 = or i32 %2, -2 |
| store i32 %3, ptr %0, align 4 |
| ret void |
| } |
| |
| ; Make sure we sign extend the constant after type legalization to allow the |
| ; use of xori. |
| define void @xori(ptr nocapture noundef %0) { |
| ; CHECK-LABEL: xori: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: lw a1, 0(a0) |
| ; CHECK-NEXT: xori a1, a1, -5 |
| ; CHECK-NEXT: sw a1, 0(a0) |
| ; CHECK-NEXT: ret |
| %2 = load i32, ptr %0, align 4 |
| %3 = xor i32 %2, -5 |
| store i32 %3, ptr %0, align 4 |
| ret void |
| } |
| |
| ; Make sure we sign extend the constant after type legalization to allow the |
| ; shorter constant materialization. |
| define void @or_signbit(ptr nocapture noundef %0) { |
| ; CHECK-LABEL: or_signbit: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: lw a1, 0(a0) |
| ; CHECK-NEXT: lui a2, 524288 |
| ; CHECK-NEXT: or a1, a1, a2 |
| ; CHECK-NEXT: sw a1, 0(a0) |
| ; CHECK-NEXT: ret |
| %2 = load i32, ptr %0, align 4 |
| %3 = or i32 %2, -2147483648 |
| store i32 %3, ptr %0, align 4 |
| ret void |
| } |
| |
| ; Make sure we sign extend the constant after type legalization to allow the |
| ; shorter constant materialization. |
| define void @xor_signbit(ptr nocapture noundef %0) { |
| ; CHECK-LABEL: xor_signbit: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: lw a1, 0(a0) |
| ; CHECK-NEXT: lui a2, 524288 |
| ; CHECK-NEXT: xor a1, a1, a2 |
| ; CHECK-NEXT: sw a1, 0(a0) |
| ; CHECK-NEXT: ret |
| %2 = load i32, ptr %0, align 4 |
| %3 = xor i32 %2, -2147483648 |
| store i32 %3, ptr %0, align 4 |
| ret void |
| } |