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
66 lines
3.0 KiB
LLVM
66 lines
3.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes=loop-vectorize,dce,instcombine -force-vector-width=2 -force-vector-interleave=2 < %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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;PR 15830.
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; When scalarizing stores we need to preserve the original order.
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; Make sure that we are extracting in the correct order (0101, and not 0011).
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define i32 @foo(ptr nocapture %A) {
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; CHECK-LABEL: @foo(
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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: [[VEC_IND:%.*]] = phi <2 x i64> [ <i64 0, i64 1>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
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; CHECK-NEXT: [[TMP0:%.*]] = shl nsw <2 x i64> [[VEC_IND]], splat (i64 2)
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; CHECK-NEXT: [[STEP_ADD:%.*]] = shl <2 x i64> [[VEC_IND]], splat (i64 2)
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; CHECK-NEXT: [[TMP1:%.*]] = add <2 x i64> [[STEP_ADD]], splat (i64 8)
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; CHECK-NEXT: [[TMP2:%.*]] = extractelement <2 x i64> [[TMP0]], i64 0
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; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[TMP2]]
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; CHECK-NEXT: [[TMP4:%.*]] = extractelement <2 x i64> [[TMP0]], i64 1
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; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[TMP4]]
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; CHECK-NEXT: [[TMP6:%.*]] = extractelement <2 x i64> [[TMP1]], i64 0
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; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[TMP6]]
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; CHECK-NEXT: [[TMP8:%.*]] = extractelement <2 x i64> [[TMP1]], i64 1
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; CHECK-NEXT: [[TMP9:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[TMP8]]
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; CHECK-NEXT: store i32 4, ptr [[TMP3]], align 4
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; CHECK-NEXT: store i32 4, ptr [[TMP5]], align 4
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; CHECK-NEXT: store i32 4, ptr [[TMP7]], align 4
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; CHECK-NEXT: store i32 4, ptr [[TMP9]], align 4
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
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; CHECK-NEXT: [[VEC_IND_NEXT]] = add <2 x i64> [[VEC_IND]], splat (i64 4)
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; CHECK-NEXT: [[TMP10:%.*]] = icmp eq i64 [[INDEX_NEXT]], 10000
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; CHECK-NEXT: br i1 [[TMP10]], 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 [[FOR_END:%.*]]
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; CHECK: scalar.ph:
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: br i1 poison, label [[FOR_END]], label [[FOR_BODY]]
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; CHECK: for.end:
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; CHECK-NEXT: ret i32 undef
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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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%0 = shl nsw i64 %indvars.iv, 2
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%arrayidx = getelementptr inbounds i32, ptr %A, i64 %0
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store i32 4, ptr %arrayidx, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, 10000
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br i1 %exitcond, label %for.end, label %for.body
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for.end:
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ret i32 undef
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}
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