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llvm-project/llvm/test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-trunc.mir

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[GlobalISel] combine G_TRUNC with G_MERGE_VALUES Summary: Truncating the result of a merge means that most likely we could have done without merge in the first place and just used the input merge inputs directly. This can be done in three cases: 1. If the truncation result is smaller than the merge source, we can use the source in the trunc directly 2. If the sizes are the same, we can replace the register or use a copy 3. If the truncation size is a multiple of the merge source size, we can build a smaller merge This gets rid of most of the larger, hard-to-legalize merges. Reviewers: qcolombet, aditya_nandakumar, aemerson, paquette, arsenm, Petar.Avramovic Reviewed By: arsenm Subscribers: sdardis, jvesely, wdng, nhaehnle, rovka, jrtc27, atanasyan, kerbowa, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D75915
2020-03-10 00:00:38 +08:00
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -O0 -mtriple=amdgcn-mesa-mesa3d -mcpu=tahiti -run-pass=legalizer %s -o - | FileCheck %s
---
name: trunc_s16_merge_s64_s32
body: |
bb.0:
; Test that trunc(merge) with trunc-size < merge-source-size creates a trunc
; of the merge source
; CHECK-LABEL: name: trunc_s16_merge_s64_s32
; CHECK: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
; CHECK: [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
; CHECK: $vgpr0 = COPY [[C]](s32)
%0:_(s32) = G_CONSTANT i32 0
%1:_(s32) = G_CONSTANT i32 1
%2:_(s64) = G_MERGE_VALUES %0, %1
%3:_(s16) = G_TRUNC %2
%4:_(s32) = G_ANYEXT %3
$vgpr0 = COPY %4
...
---
name: trunc_s32_merge_s64_s32
body: |
bb.0:
; Test that trunc(merge) with trunc-size == merge-source-size is eliminated
; CHECK-LABEL: name: trunc_s32_merge_s64_s32
; CHECK: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
; CHECK: [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
; CHECK: $vgpr0 = COPY [[C]](s32)
%0:_(s32) = G_CONSTANT i32 0
%1:_(s32) = G_CONSTANT i32 1
%2:_(s64) = G_MERGE_VALUES %0, %1
%3:_(s32) = G_TRUNC %2
$vgpr0 = COPY %3
...
---
name: trunc_s64_merge_s128_s32
body: |
bb.0:
; Test that trunc(merge) with trunc-size > merge-source-size combines to a
; smaller merge
; CHECK-LABEL: name: trunc_s64_merge_s128_s32
; CHECK: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
; CHECK: [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
; CHECK: [[MV:%[0-9]+]]:_(s64) = G_MERGE_VALUES [[C]](s32), [[C1]](s32)
; CHECK: $vgpr0_vgpr1 = COPY [[MV]](s64)
%0:_(s32) = G_CONSTANT i32 0
%1:_(s32) = G_CONSTANT i32 1
%2:_(s128) = G_MERGE_VALUES %0, %1, %0, %1
%3:_(s64) = G_TRUNC %2
$vgpr0_vgpr1 = COPY %3
...
---
name: trunc_s32_merge_s128_p0
body: |
bb.0:
; Test that trunc(merge) with a non-scalar merge source is not combined
; CHECK-LABEL: name: trunc_s32_merge_s128_p0
; CHECK: [[C:%[0-9]+]]:_(p0) = G_CONSTANT i64 0
; CHECK: [[C1:%[0-9]+]]:_(p0) = G_CONSTANT i64 1
; CHECK: [[MV:%[0-9]+]]:_(s128) = G_MERGE_VALUES [[C]](p0), [[C1]](p0)
; CHECK: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[MV]](s128)
; CHECK: $vgpr0 = COPY [[TRUNC]](s32)
%0:_(p0) = G_CONSTANT i64 0
%1:_(p0) = G_CONSTANT i64 1
%2:_(s128) = G_MERGE_VALUES %0, %1
%3:_(s32) = G_TRUNC %2
$vgpr0 = COPY %3
...
---
name: trunc_s64_merge_s128_p0
body: |
bb.0:
; Test that trunc(merge) with a non-scalar merge source is not combined
; CHECK-LABEL: name: trunc_s64_merge_s128_p0
; CHECK: [[C:%[0-9]+]]:_(p0) = G_CONSTANT i64 0
; CHECK: [[C1:%[0-9]+]]:_(p0) = G_CONSTANT i64 1
; CHECK: [[MV:%[0-9]+]]:_(s128) = G_MERGE_VALUES [[C]](p0), [[C1]](p0)
; CHECK: [[TRUNC:%[0-9]+]]:_(s64) = G_TRUNC [[MV]](s128)
; CHECK: $vgpr0_vgpr1 = COPY [[TRUNC]](s64)
%0:_(p0) = G_CONSTANT i64 0
%1:_(p0) = G_CONSTANT i64 1
%2:_(s128) = G_MERGE_VALUES %0, %1
%3:_(s64) = G_TRUNC %2
$vgpr0_vgpr1 = COPY %3
...
---
name: trunc_s128_merge_s192_p0
body: |
bb.0:
; Test that trunc(merge) with a non-scalar merge source is not combined
; CHECK-LABEL: name: trunc_s128_merge_s192_p0
; CHECK: [[C:%[0-9]+]]:_(p0) = G_CONSTANT i64 0
; CHECK: [[C1:%[0-9]+]]:_(p0) = G_CONSTANT i64 1
; CHECK: [[MV:%[0-9]+]]:_(s192) = G_MERGE_VALUES [[C]](p0), [[C1]](p0), [[C]](p0)
; CHECK: [[TRUNC:%[0-9]+]]:_(s128) = G_TRUNC [[MV]](s192)
; CHECK: $vgpr0_vgpr1_vgpr2_vgpr3 = COPY [[TRUNC]](s128)
%0:_(p0) = G_CONSTANT i64 0
%1:_(p0) = G_CONSTANT i64 1
%2:_(s192) = G_MERGE_VALUES %0, %1, %0
%3:_(s128) = G_TRUNC %2
$vgpr0_vgpr1_vgpr2_vgpr3 = COPY %3
...
---
name: trunc_s68_merge_s128_s32
body: |
bb.0:
[GlobalISel] combine trunc(trunc) pattern Summary: Legalization can introduce the trunc(trunc) pattern. This can cause problems if one of these intermediate truncs is not legal. Combine truncs of this pattern, if the resulting trunc is legal. Reviewers: arsenm, aemerson, dsanders Reviewed By: arsenm Subscribers: jvesely, wdng, nhaehnle, rovka, kerbowa, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D76601
2020-03-23 19:58:55 +08:00
; Test that trunc(merge) with trunc-size > merge-source-size and
; trunc-size % merge-source-size != 0 can be combined after the G_TRUNCs
; have been combined.
[GlobalISel] combine G_TRUNC with G_MERGE_VALUES Summary: Truncating the result of a merge means that most likely we could have done without merge in the first place and just used the input merge inputs directly. This can be done in three cases: 1. If the truncation result is smaller than the merge source, we can use the source in the trunc directly 2. If the sizes are the same, we can replace the register or use a copy 3. If the truncation size is a multiple of the merge source size, we can build a smaller merge This gets rid of most of the larger, hard-to-legalize merges. Reviewers: qcolombet, aditya_nandakumar, aemerson, paquette, arsenm, Petar.Avramovic Reviewed By: arsenm Subscribers: sdardis, jvesely, wdng, nhaehnle, rovka, jrtc27, atanasyan, kerbowa, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D75915
2020-03-10 00:00:38 +08:00
; CHECK-LABEL: name: trunc_s68_merge_s128_s32
; CHECK: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
; CHECK: [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
[GlobalISel] combine trunc(trunc) pattern Summary: Legalization can introduce the trunc(trunc) pattern. This can cause problems if one of these intermediate truncs is not legal. Combine truncs of this pattern, if the resulting trunc is legal. Reviewers: arsenm, aemerson, dsanders Reviewed By: arsenm Subscribers: jvesely, wdng, nhaehnle, rovka, kerbowa, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D76601
2020-03-23 19:58:55 +08:00
; CHECK: $vgpr0 = COPY [[C]](s32)
[GlobalISel] combine G_TRUNC with G_MERGE_VALUES Summary: Truncating the result of a merge means that most likely we could have done without merge in the first place and just used the input merge inputs directly. This can be done in three cases: 1. If the truncation result is smaller than the merge source, we can use the source in the trunc directly 2. If the sizes are the same, we can replace the register or use a copy 3. If the truncation size is a multiple of the merge source size, we can build a smaller merge This gets rid of most of the larger, hard-to-legalize merges. Reviewers: qcolombet, aditya_nandakumar, aemerson, paquette, arsenm, Petar.Avramovic Reviewed By: arsenm Subscribers: sdardis, jvesely, wdng, nhaehnle, rovka, jrtc27, atanasyan, kerbowa, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D75915
2020-03-10 00:00:38 +08:00
%0:_(s32) = G_CONSTANT i32 0
%1:_(s32) = G_CONSTANT i32 1
%2:_(s128) = G_MERGE_VALUES %0, %1, %0, %1
%3:_(s68) = G_TRUNC %2
%4:_(s32) = G_TRUNC %3
$vgpr0 = COPY %4
...
[GlobalISel] combine trunc(trunc) pattern Summary: Legalization can introduce the trunc(trunc) pattern. This can cause problems if one of these intermediate truncs is not legal. Combine truncs of this pattern, if the resulting trunc is legal. Reviewers: arsenm, aemerson, dsanders Reviewed By: arsenm Subscribers: jvesely, wdng, nhaehnle, rovka, kerbowa, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D76601
2020-03-23 19:58:55 +08:00
---
name: trunc_trunc
body: |
bb.0:
; Test that trunc(trunc) is combined to a single trunc
; CHECK-LABEL: name: trunc_trunc
; CHECK: [[DEF:%[0-9]+]]:_(s64) = G_IMPLICIT_DEF
; CHECK: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[DEF]](s64)
; CHECK: $vgpr0 = COPY [[TRUNC]](s32)
%0:_(s64) = G_IMPLICIT_DEF
%1:_(s48) = G_TRUNC %0
%2:_(s32) = G_TRUNC %1
$vgpr0 = COPY %2
...