[llvm] [GlobalIsel] Combine freeze (PR #93239)
Thorsten Schütt via llvm-commits
llvm-commits at lists.llvm.org
Sat May 25 12:40:09 PDT 2024
================
@@ -0,0 +1,607 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -o - -mtriple=aarch64-unknown-unknown -run-pass=aarch64-prelegalizer-combiner -verify-machineinstrs %s | FileCheck %s
+
+...
+---
+name: freeze_register
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_register
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(s64) = COPY $x0
+ ; CHECK-NEXT: [[FREEZE:%[0-9]+]]:_(s64) = G_FREEZE [[COPY]]
+ ; CHECK-NEXT: $x0 = COPY [[FREEZE]](s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %0:_(s64) = COPY $x0
+ %1:_(s64) = G_FREEZE %0
+ $x0 = COPY %1(s64)
+ RET_ReallyLR implicit $x0
+
+...
+---
+name: freeze_constant
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_constant
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 9
+ ; CHECK-NEXT: $x0 = COPY [[C]](s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %1:_(s64) = G_CONSTANT i64 9
+ %2:_(s64) = G_FREEZE %1
+ $x0 = COPY %2(s64)
+ RET_ReallyLR implicit $x0
+
+...
+---
+name: freeze_fconstant
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_fconstant
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: [[C:%[0-9]+]]:_(s64) = G_FCONSTANT double 9.000000e+00
+ ; CHECK-NEXT: $x0 = COPY [[C]](s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %1:_(s64) = G_FCONSTANT double 9.0
+ %2:_(s64) = G_FREEZE %1
+ $x0 = COPY %2(s64)
+ RET_ReallyLR implicit $x0
+...
+---
+name: freeze_undef
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_undef
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: [[DEF:%[0-9]+]]:_(s64) = G_IMPLICIT_DEF
+ ; CHECK-NEXT: [[FREEZE:%[0-9]+]]:_(s64) = G_FREEZE [[DEF]]
+ ; CHECK-NEXT: $x0 = COPY [[FREEZE]](s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %1:_(s64) = G_IMPLICIT_DEF
+ %2:_(s64) = G_FREEZE %1
+ $x0 = COPY %2(s64)
+ RET_ReallyLR implicit $x0
+...
+---
+name: freeze_freeze
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_freeze
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(s64) = COPY $x0
+ ; CHECK-NEXT: [[FREEZE:%[0-9]+]]:_(s64) = G_FREEZE [[COPY]]
+ ; CHECK-NEXT: $x0 = COPY [[FREEZE]](s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %0:_(s64) = COPY $x0
+ %1:_(s64) = G_FREEZE %0
+ %2:_(s64) = G_FREEZE %1
+ $x0 = COPY %2(s64)
+ RET_ReallyLR implicit $x0
+...
+---
+name: freeze_buildvector
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_buildvector
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $w0
+ ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR [[COPY]](s32), [[COPY]](s32), [[COPY]](s32), [[COPY]](s32)
+ ; CHECK-NEXT: [[FREEZE:%[0-9]+]]:_(<4 x s32>) = G_FREEZE [[BUILD_VECTOR]]
+ ; CHECK-NEXT: $q0 = COPY [[FREEZE]](<4 x s32>)
+ ; CHECK-NEXT: RET_ReallyLR implicit $q0
+ %0:_(s32) = COPY $w0
+ %1:_(<4 x s32>) = G_BUILD_VECTOR %0(s32), %0(s32), %0(s32), %0(s32)
+ %2:_(<4 x s32>) = G_FREEZE %1
+ $q0 = COPY %2(<4 x s32>)
+ RET_ReallyLR implicit $q0
+...
+---
+name: freeze_buildvector_const
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_buildvector_const
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %c:_(s32) = G_CONSTANT i32 6
+ ; CHECK-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<4 x s32>) = G_BUILD_VECTOR %c(s32), %c(s32), %c(s32), %c(s32)
+ ; CHECK-NEXT: $q0 = COPY [[BUILD_VECTOR]](<4 x s32>)
+ ; CHECK-NEXT: RET_ReallyLR implicit $q0
+ %0:_(s32) = COPY $w0
+ %c:_(s32) = G_CONSTANT i32 6
+ %1:_(<4 x s32>) = G_BUILD_VECTOR %c(s32), %c(s32), %c(s32), %c(s32)
+ %2:_(<4 x s32>) = G_FREEZE %1
+ $q0 = COPY %2(<4 x s32>)
+ RET_ReallyLR implicit $q0
+...
+---
+name: freeze_disjoint_or_fold_barrier
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_disjoint_or_fold_barrier
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %cst:_(s64) = G_CONSTANT i64 9
+ ; CHECK-NEXT: %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ ; CHECK-NEXT: $x0 = COPY %c(s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %0:_(s64) = COPY $x0
+ %cst:_(s64) = G_CONSTANT i64 9
+ %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ %1:_(s64) = disjoint G_OR %c, %c
+ %2:_(s64) = G_FREEZE %1
+ $x0 = COPY %2(s64)
+ RET_ReallyLR implicit $x0
+...
+---
+name: freeze_or_fold_barrier
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_or_fold_barrier
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %cst:_(s64) = G_CONSTANT i64 9
+ ; CHECK-NEXT: %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ ; CHECK-NEXT: $x0 = COPY %c(s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %0:_(s64) = COPY $x0
+ %cst:_(s64) = G_CONSTANT i64 9
+ %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ %1:_(s64) = G_OR %c, %c
+ %2:_(s64) = G_FREEZE %1
+ $x0 = COPY %2(s64)
+ RET_ReallyLR implicit $x0
+...
+---
+name: freeze_nneg_zext_fold_barrier
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_nneg_zext_fold_barrier
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %cst:_(s32) = G_CONSTANT i32 9
+ ; CHECK-NEXT: %c:_(s32) = G_CONSTANT_FOLD_BARRIER %cst
+ ; CHECK-NEXT: [[ZEXT:%[0-9]+]]:_(s64) = G_ZEXT %c(s32)
+ ; CHECK-NEXT: $x0 = COPY [[ZEXT]](s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %0:_(s64) = COPY $x0
+ %cst:_(s32) = G_CONSTANT i32 9
+ %c:_(s32) = G_CONSTANT_FOLD_BARRIER %cst
+ %1:_(s64) = nneg G_ZEXT %c
+ %2:_(s64) = G_FREEZE %1
+ $x0 = COPY %2(s64)
+ RET_ReallyLR implicit $x0
+...
+---
+name: freeze_zext_fold_barrier
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_zext_fold_barrier
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %cst:_(s32) = G_CONSTANT i32 9
+ ; CHECK-NEXT: %c:_(s32) = G_CONSTANT_FOLD_BARRIER %cst
+ ; CHECK-NEXT: [[ZEXT:%[0-9]+]]:_(s64) = G_ZEXT %c(s32)
+ ; CHECK-NEXT: $x0 = COPY [[ZEXT]](s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %0:_(s64) = COPY $x0
+ %cst:_(s32) = G_CONSTANT i32 9
+ %c:_(s32) = G_CONSTANT_FOLD_BARRIER %cst
+ %1:_(s64) = G_ZEXT %c
+ %2:_(s64) = G_FREEZE %1
+ $x0 = COPY %2(s64)
+ RET_ReallyLR implicit $x0
+...
+---
+name: freeze_udiv_fold_barrier
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_udiv_fold_barrier
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %cst:_(s64) = G_CONSTANT i64 9
+ ; CHECK-NEXT: %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ ; CHECK-NEXT: [[UDIV:%[0-9]+]]:_(s64) = G_UDIV %c, %c
+ ; CHECK-NEXT: $x0 = COPY [[UDIV]](s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %0:_(s64) = COPY $x0
+ %cst:_(s64) = G_CONSTANT i64 9
+ %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ %1:_(s64) = G_UDIV %c, %c
+ %2:_(s64) = G_FREEZE %1
+ $x0 = COPY %2(s64)
+ RET_ReallyLR implicit $x0
+...
+---
+name: freeze_exact_udiv_fold_barrier
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_exact_udiv_fold_barrier
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %cst:_(s64) = G_CONSTANT i64 9
+ ; CHECK-NEXT: %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ ; CHECK-NEXT: [[UDIV:%[0-9]+]]:_(s64) = G_UDIV %c, %c
+ ; CHECK-NEXT: $x0 = COPY [[UDIV]](s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %0:_(s64) = COPY $x0
+ %cst:_(s64) = G_CONSTANT i64 9
+ %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ %1:_(s64) = exact G_UDIV %c, %c
+ %2:_(s64) = G_FREEZE %1
+ $x0 = COPY %2(s64)
+ RET_ReallyLR implicit $x0
+...
+---
+name: freeze_mul_fold_barrier
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_mul_fold_barrier
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %cst:_(s64) = G_CONSTANT i64 9
+ ; CHECK-NEXT: %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ ; CHECK-NEXT: [[MUL:%[0-9]+]]:_(s64) = G_MUL %c, %c
+ ; CHECK-NEXT: $x0 = COPY [[MUL]](s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %0:_(s64) = COPY $x0
+ %cst:_(s64) = G_CONSTANT i64 9
+ %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ %1:_(s64) = G_MUL %c, %c
+ %2:_(s64) = G_FREEZE %1
+ $x0 = COPY %2(s64)
+ RET_ReallyLR implicit $x0
+...
+---
+name: freeze_nsw_mul_fold_barrier
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_nsw_mul_fold_barrier
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %cst:_(s64) = G_CONSTANT i64 9
+ ; CHECK-NEXT: %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ ; CHECK-NEXT: [[MUL:%[0-9]+]]:_(s64) = G_MUL %c, %c
+ ; CHECK-NEXT: $x0 = COPY [[MUL]](s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %0:_(s64) = COPY $x0
+ %cst:_(s64) = G_CONSTANT i64 9
+ %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ %1:_(s64) = nsw G_MUL %c, %c
+ %2:_(s64) = G_FREEZE %1
+ $x0 = COPY %2(s64)
+ RET_ReallyLR implicit $x0
+...
+---
+name: freeze_trunc_fold_barrier
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_trunc_fold_barrier
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %cst:_(s64) = G_CONSTANT i64 9
+ ; CHECK-NEXT: %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ ; CHECK-NEXT: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC %c(s64)
+ ; CHECK-NEXT: $w0 = COPY [[TRUNC]](s32)
+ ; CHECK-NEXT: RET_ReallyLR implicit $q0
+ %0:_(s64) = COPY $x0
+ %cst:_(s64) = G_CONSTANT i64 9
+ %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ %1:_(s32) = G_TRUNC %c
+ %2:_(s32) = G_FREEZE %1
+ $w0 = COPY %2(s32)
+ RET_ReallyLR implicit $q0
+...
+---
+name: freeze_nuw_trunc_fold_barrier
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_nuw_trunc_fold_barrier
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %cst:_(s64) = G_CONSTANT i64 9
+ ; CHECK-NEXT: %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ ; CHECK-NEXT: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC %c(s64)
+ ; CHECK-NEXT: $w0 = COPY [[TRUNC]](s32)
+ ; CHECK-NEXT: RET_ReallyLR implicit $q0
+ %0:_(s64) = COPY $x0
+ %cst:_(s64) = G_CONSTANT i64 9
+ %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ %1:_(s32) = nuw G_TRUNC %c
+ %2:_(s32) = G_FREEZE %1
+ $w0 = COPY %2(s32)
+ RET_ReallyLR implicit $q0
+...
+---
+name: freeze_add_fold_barrier
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_add_fold_barrier
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %cst:_(s64) = G_CONSTANT i64 9
+ ; CHECK-NEXT: %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ ; CHECK-NEXT: [[ADD:%[0-9]+]]:_(s64) = G_ADD %c, %c
+ ; CHECK-NEXT: $x0 = COPY [[ADD]](s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %0:_(s64) = COPY $x0
+ %cst:_(s64) = G_CONSTANT i64 9
+ %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ %1:_(s64) = G_ADD %c, %c
+ %2:_(s64) = G_FREEZE %1
+ $x0 = COPY %2(s64)
+ RET_ReallyLR implicit $x0
+...
+---
+name: freeze_nuw_add_fold_barrier
+body: |
+ bb.1:
+ liveins: $w0
+
+ ; CHECK-LABEL: name: freeze_nuw_add_fold_barrier
+ ; CHECK: liveins: $w0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %cst:_(s64) = G_CONSTANT i64 9
+ ; CHECK-NEXT: %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ ; CHECK-NEXT: [[ADD:%[0-9]+]]:_(s64) = G_ADD %c, %c
+ ; CHECK-NEXT: $x0 = COPY [[ADD]](s64)
+ ; CHECK-NEXT: RET_ReallyLR implicit $x0
+ %0:_(s64) = COPY $x0
+ %cst:_(s64) = G_CONSTANT i64 9
+ %c:_(s64) = G_CONSTANT_FOLD_BARRIER %cst
+ %1:_(s64) = nuw G_ADD %c, %c
----------------
tschuett wrote:
It ignores the `nuw` flag and it disappears.
https://github.com/llvm/llvm-project/pull/93239
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