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
58 lines
2.6 KiB
LLVM
58 lines
2.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; RUN: opt < %s -passes=loop-vectorize -force-vector-width=2 -S | FileCheck %s
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define void @d() {
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; CHECK-LABEL: define void @d() {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[VECTOR_PH:%.*]]
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; CHECK: vector.ph:
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; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
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; CHECK: vector.body:
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; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
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; CHECK-NEXT: [[TMP0:%.*]] = load float, ptr null, align 4
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; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <2 x float> poison, float [[TMP0]], i64 0
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; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <2 x float> [[BROADCAST_SPLATINSERT]], <2 x float> poison, <2 x i32> zeroinitializer
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; CHECK-NEXT: [[TMP1:%.*]] = getelementptr float, ptr @d, i64 [[INDEX]]
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; CHECK-NEXT: [[TMP2:%.*]] = call <2 x i1> @llvm.is.fpclass.v2f32(<2 x float> [[BROADCAST_SPLAT]], i32 0)
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; CHECK-NEXT: [[TMP3:%.*]] = select <2 x i1> [[TMP2]], <2 x float> zeroinitializer, <2 x float> splat (float 1.000000e+00)
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; CHECK-NEXT: store <2 x float> [[TMP3]], ptr [[TMP1]], align 4
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
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; CHECK-NEXT: [[TMP7:%.*]] = icmp eq i64 [[INDEX_NEXT]], 128
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; CHECK-NEXT: br i1 [[TMP7]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
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; CHECK: middle.block:
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; CHECK-NEXT: br label [[EXIT:%.*]]
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; CHECK: scalar.ph:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[I:%.*]] = phi i64 [ 0, [[SCALAR_PH:%.*]] ], [ [[I7:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[I3:%.*]] = load float, ptr null, align 4
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; CHECK-NEXT: [[I4:%.*]] = getelementptr float, ptr @d, i64 [[I]]
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; CHECK-NEXT: [[I5:%.*]] = tail call i1 @llvm.is.fpclass.f32(float [[I3]], i32 0)
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; CHECK-NEXT: [[I6:%.*]] = select i1 [[I5]], float 0.000000e+00, float 1.000000e+00
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; CHECK-NEXT: store float [[I6]], ptr [[I4]], align 4
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; CHECK-NEXT: [[I7]] = add i64 [[I]], 1
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; CHECK-NEXT: [[I8:%.*]] = icmp eq i64 [[I7]], 128
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; CHECK-NEXT: br i1 [[I8]], label [[EXIT]], label [[LOOP]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %loop
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loop:
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%i = phi i64 [ 0, %entry ], [ %i7, %loop ]
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%i3 = load float, ptr null, align 4
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%i4 = getelementptr float, ptr @d, i64 %i
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%i5 = tail call i1 @llvm.is.fpclass.f32(float %i3, i32 0)
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%i6 = select i1 %i5, float 0.0, float 1.0
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store float %i6, ptr %i4, align 4
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%i7 = add i64 %i, 1
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%i8 = icmp eq i64 %i7, 128
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br i1 %i8, label %exit, label %loop
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exit:
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ret void
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}
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declare i1 @llvm.is.fpclass.f32(float, i32 immarg)
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