| ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py |
| ; RUN: llc -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s |
| |
| ; Fold |
| ; ptr - (ptr & (alignment-1)) |
| ; To |
| ; ptr & (0 - alignment) |
| ; |
| ; This needs to be a backend-level fold because only by now pointers |
| ; are just registers; in middle-end IR this can only be done via @llvm.ptrmask() |
| ; intrinsic which is not sufficiently widely-spread yet. |
| ; |
| ; https://bugs.llvm.org/show_bug.cgi?id=44448 |
| |
| ; The basic positive tests |
| |
| define i32 @t0_32(i32 %ptr, i32 %alignment) nounwind { |
| ; CHECK-LABEL: t0_32: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: neg w8, w1 |
| ; CHECK-NEXT: and w0, w0, w8 |
| ; CHECK-NEXT: ret |
| %mask = add i32 %alignment, -1 |
| %bias = and i32 %ptr, %mask |
| %r = sub i32 %ptr, %bias |
| ret i32 %r |
| } |
| define i64 @t1_64(i64 %ptr, i64 %alignment) nounwind { |
| ; CHECK-LABEL: t1_64: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: neg x8, x1 |
| ; CHECK-NEXT: and x0, x0, x8 |
| ; CHECK-NEXT: ret |
| %mask = add i64 %alignment, -1 |
| %bias = and i64 %ptr, %mask |
| %r = sub i64 %ptr, %bias |
| ret i64 %r |
| } |
| |
| define i32 @t2_commutative(i32 %ptr, i32 %alignment) nounwind { |
| ; CHECK-LABEL: t2_commutative: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: neg w8, w1 |
| ; CHECK-NEXT: and w0, w0, w8 |
| ; CHECK-NEXT: ret |
| %mask = add i32 %alignment, -1 |
| %bias = and i32 %mask, %ptr ; swapped |
| %r = sub i32 %ptr, %bias |
| ret i32 %r |
| } |
| |
| ; Extra use tests |
| |
| define i32 @t3_extrause0(i32 %ptr, i32 %alignment, i32* %mask_storage) nounwind { |
| ; CHECK-LABEL: t3_extrause0: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: neg w8, w1 |
| ; CHECK-NEXT: and w0, w0, w8 |
| ; CHECK-NEXT: sub w8, w1, #1 |
| ; CHECK-NEXT: str w8, [x2] |
| ; CHECK-NEXT: ret |
| %mask = add i32 %alignment, -1 |
| store i32 %mask, i32* %mask_storage |
| %bias = and i32 %ptr, %mask |
| %r = sub i32 %ptr, %bias |
| ret i32 %r |
| } |
| define i32 @n4_extrause1(i32 %ptr, i32 %alignment, i32* %bias_storage) nounwind { |
| ; CHECK-LABEL: n4_extrause1: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: sub w8, w1, #1 |
| ; CHECK-NEXT: and w8, w0, w8 |
| ; CHECK-NEXT: sub w0, w0, w8 |
| ; CHECK-NEXT: str w8, [x2] |
| ; CHECK-NEXT: ret |
| %mask = add i32 %alignment, -1 |
| %bias = and i32 %ptr, %mask ; has extra uses, can't fold |
| store i32 %bias, i32* %bias_storage |
| %r = sub i32 %ptr, %bias |
| ret i32 %r |
| } |
| define i32 @n5_extrause2(i32 %ptr, i32 %alignment, i32* %mask_storage, i32* %bias_storage) nounwind { |
| ; CHECK-LABEL: n5_extrause2: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: sub w8, w1, #1 |
| ; CHECK-NEXT: and w9, w0, w8 |
| ; CHECK-NEXT: sub w0, w0, w9 |
| ; CHECK-NEXT: str w8, [x2] |
| ; CHECK-NEXT: str w9, [x3] |
| ; CHECK-NEXT: ret |
| %mask = add i32 %alignment, -1 |
| store i32 %mask, i32* %mask_storage |
| %bias = and i32 %ptr, %mask ; has extra uses, can't fold |
| store i32 %bias, i32* %bias_storage |
| %r = sub i32 %ptr, %bias |
| ret i32 %r |
| } |
| |
| ; Negative tests |
| |
| define i32 @n6_different_ptrs(i32 %ptr0, i32 %ptr1, i32 %alignment) nounwind { |
| ; CHECK-LABEL: n6_different_ptrs: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: sub w8, w2, #1 |
| ; CHECK-NEXT: and w8, w1, w8 |
| ; CHECK-NEXT: sub w0, w0, w8 |
| ; CHECK-NEXT: ret |
| %mask = add i32 %alignment, -1 |
| %bias = and i32 %ptr1, %mask ; not %ptr0 |
| %r = sub i32 %ptr0, %bias ; not %ptr1 |
| ret i32 %r |
| } |
| define i32 @n7_different_ptrs_commutative(i32 %ptr0, i32 %ptr1, i32 %alignment) nounwind { |
| ; CHECK-LABEL: n7_different_ptrs_commutative: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: sub w8, w2, #1 |
| ; CHECK-NEXT: and w8, w8, w1 |
| ; CHECK-NEXT: sub w0, w0, w8 |
| ; CHECK-NEXT: ret |
| %mask = add i32 %alignment, -1 |
| %bias = and i32 %mask, %ptr1 ; swapped, not %ptr0 |
| %r = sub i32 %ptr0, %bias ; not %ptr1 |
| ret i32 %r |
| } |
| |
| define i32 @n8_not_lowbit_mask(i32 %ptr, i32 %alignment) nounwind { |
| ; CHECK-LABEL: n8_not_lowbit_mask: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: add w8, w1, #1 |
| ; CHECK-NEXT: bic w0, w0, w8 |
| ; CHECK-NEXT: ret |
| %mask = add i32 %alignment, 1 ; not -1 |
| %bias = and i32 %ptr, %mask |
| %r = sub i32 %ptr, %bias |
| ret i32 %r |
| } |
| |
| define i32 @n9_sub_is_not_commutative(i32 %ptr, i32 %alignment) nounwind { |
| ; CHECK-LABEL: n9_sub_is_not_commutative: |
| ; CHECK: // %bb.0: |
| ; CHECK-NEXT: sub w8, w1, #1 |
| ; CHECK-NEXT: and w8, w0, w8 |
| ; CHECK-NEXT: sub w0, w8, w0 |
| ; CHECK-NEXT: ret |
| %mask = add i32 %alignment, -1 |
| %bias = and i32 %ptr, %mask |
| %r = sub i32 %bias, %ptr ; wrong order |
| ret i32 %r |
| } |