50b9ca4dda
After https://github.com/llvm/llvm-project/pull/153643, there may be a BranchOnCond with constant condition in the entry block. Simplify those in removeBranchOnConst. This removes a number of redundant conditional branch from entry blocks. In some cases, it may also make the original scalar loop unreachable, because we know it will never execute. In that case, we need to remove the loop from LoopInfo, because all unreachable blocks may dominate each other, making LoopInfo invalid. In those cases, we can also completely remove the loop, for which I'll share a follow-up patch. Depends on https://github.com/llvm/llvm-project/pull/153643. PR: https://github.com/llvm/llvm-project/pull/154510
97 lines
5.3 KiB
LLVM
97 lines
5.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 < %s -passes=loop-vectorize,dce,instcombine -S | FileCheck -check-prefix=GFX9 %s
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; RUN: opt -mtriple=amdgcn-amd-amdhsa -mcpu=fiji < %s -passes=loop-vectorize,dce,instcombine -S | FileCheck -check-prefix=VI %s
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; RUN: opt -mtriple=amdgcn-amd-amdhsa -mcpu=hawaii < %s -passes=loop-vectorize,dce,instcombine -S | FileCheck -check-prefix=CI %s
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define half @vectorize_v2f16_loop(ptr addrspace(1) noalias %s) {
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; GFX9-LABEL: @vectorize_v2f16_loop(
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; GFX9-NEXT: entry:
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; GFX9-NEXT: br label [[VECTOR_PH:%.*]]
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; GFX9: vector.ph:
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; GFX9-NEXT: br label [[VECTOR_BODY:%.*]]
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; GFX9: vector.body:
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; GFX9-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
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; GFX9-NEXT: [[VEC_PHI:%.*]] = phi <2 x half> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP2:%.*]], [[VECTOR_BODY]] ]
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; GFX9-NEXT: [[VEC_PHI1:%.*]] = phi <2 x half> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP3:%.*]], [[VECTOR_BODY]] ]
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; GFX9-NEXT: [[TMP0:%.*]] = getelementptr inbounds half, ptr addrspace(1) [[S:%.*]], i64 [[INDEX]]
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; GFX9-NEXT: [[TMP1:%.*]] = getelementptr inbounds nuw i8, ptr addrspace(1) [[TMP0]], i64 4
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; GFX9-NEXT: [[WIDE_LOAD:%.*]] = load <2 x half>, ptr addrspace(1) [[TMP0]], align 2
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; GFX9-NEXT: [[WIDE_LOAD2:%.*]] = load <2 x half>, ptr addrspace(1) [[TMP1]], align 2
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; GFX9-NEXT: [[TMP2]] = fadd fast <2 x half> [[VEC_PHI]], [[WIDE_LOAD]]
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; GFX9-NEXT: [[TMP3]] = fadd fast <2 x half> [[VEC_PHI1]], [[WIDE_LOAD2]]
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; GFX9-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
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; GFX9-NEXT: [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], 256
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; GFX9-NEXT: br i1 [[TMP4]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
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; GFX9: middle.block:
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; GFX9-NEXT: br label [[FOR_END:%.*]]
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; GFX9: scalar.ph:
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; GFX9-NEXT: br label [[FOR_BODY:%.*]]
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; GFX9: for.body:
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; GFX9-NEXT: br i1 poison, label [[FOR_END]], label [[FOR_BODY]]
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; GFX9: for.end:
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; GFX9-NEXT: [[BIN_RDX:%.*]] = fadd fast <2 x half> [[TMP3]], [[TMP2]]
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; GFX9-NEXT: [[ADD_LCSSA:%.*]] = call fast half @llvm.vector.reduce.fadd.v2f16(half 0xH0000, <2 x half> [[BIN_RDX]])
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; GFX9-NEXT: ret half [[ADD_LCSSA]]
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;
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; VI-LABEL: @vectorize_v2f16_loop(
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; VI-NEXT: entry:
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; VI-NEXT: br label [[VECTOR_PH:%.*]]
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; VI: vector.ph:
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; VI-NEXT: br label [[VECTOR_BODY:%.*]]
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; VI: vector.body:
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; VI-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
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; VI-NEXT: [[VEC_PHI:%.*]] = phi <2 x half> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP2:%.*]], [[VECTOR_BODY]] ]
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; VI-NEXT: [[VEC_PHI1:%.*]] = phi <2 x half> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP3:%.*]], [[VECTOR_BODY]] ]
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; VI-NEXT: [[TMP0:%.*]] = getelementptr inbounds half, ptr addrspace(1) [[S:%.*]], i64 [[INDEX]]
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; VI-NEXT: [[TMP1:%.*]] = getelementptr inbounds nuw i8, ptr addrspace(1) [[TMP0]], i64 4
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; VI-NEXT: [[WIDE_LOAD:%.*]] = load <2 x half>, ptr addrspace(1) [[TMP0]], align 2
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; VI-NEXT: [[WIDE_LOAD2:%.*]] = load <2 x half>, ptr addrspace(1) [[TMP1]], align 2
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; VI-NEXT: [[TMP2]] = fadd fast <2 x half> [[VEC_PHI]], [[WIDE_LOAD]]
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; VI-NEXT: [[TMP3]] = fadd fast <2 x half> [[VEC_PHI1]], [[WIDE_LOAD2]]
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; VI-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
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; VI-NEXT: [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], 256
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; VI-NEXT: br i1 [[TMP4]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
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; VI: middle.block:
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; VI-NEXT: br label [[FOR_END:%.*]]
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; VI: scalar.ph:
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; VI-NEXT: br label [[FOR_BODY:%.*]]
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; VI: for.body:
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; VI-NEXT: br i1 poison, label [[FOR_END]], label [[FOR_BODY]]
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; VI: for.end:
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; VI-NEXT: [[BIN_RDX:%.*]] = fadd fast <2 x half> [[TMP3]], [[TMP2]]
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; VI-NEXT: [[ADD_LCSSA:%.*]] = call fast half @llvm.vector.reduce.fadd.v2f16(half 0xH0000, <2 x half> [[BIN_RDX]])
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; VI-NEXT: ret half [[ADD_LCSSA]]
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;
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; CI-LABEL: @vectorize_v2f16_loop(
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; CI-NEXT: entry:
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; CI-NEXT: br label [[FOR_BODY:%.*]]
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; CI: for.body:
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; CI-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
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; CI-NEXT: [[Q_04:%.*]] = phi half [ 0xH0000, [[ENTRY]] ], [ [[ADD:%.*]], [[FOR_BODY]] ]
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; CI-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds nuw half, ptr addrspace(1) [[S:%.*]], i64 [[INDVARS_IV]]
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; CI-NEXT: [[TMP0:%.*]] = load half, ptr addrspace(1) [[ARRAYIDX]], align 2
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; CI-NEXT: [[ADD]] = fadd fast half [[Q_04]], [[TMP0]]
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; CI-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
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; CI-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], 256
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; CI-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
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; CI: for.end:
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; CI-NEXT: ret half [[ADD]]
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;
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entry:
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br label %for.body
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for.body:
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%q.04 = phi half [ 0.0, %entry ], [ %add, %for.body ]
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%arrayidx = getelementptr inbounds half, ptr addrspace(1) %s, i64 %indvars.iv
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%0 = load half, ptr addrspace(1) %arrayidx, align 2
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%add = fadd fast half %q.04, %0
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, 256
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br i1 %exitcond, label %for.end, label %for.body
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for.end:
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%add.lcssa = phi half [ %add, %for.body ]
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ret half %add.lcssa
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}
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