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
43 lines
1.9 KiB
LLVM
43 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --filter-out-after "vector.ph\:" --version 5
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; RUN: opt < %s -passes=loop-vectorize,dce,instcombine -force-vector-interleave=1 -force-vector-width=4 -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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define void @add_ints(ptr nocapture %A, ptr nocapture %B, ptr nocapture %C) {
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; CHECK-LABEL: define void @add_ints(
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; CHECK-SAME: ptr captures(none) [[A:%.*]], ptr captures(none) [[B:%.*]], ptr captures(none) [[C:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: br label %[[VECTOR_MEMCHECK:.*]]
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; CHECK: [[VECTOR_MEMCHECK]]:
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; CHECK-NEXT: [[A1:%.*]] = ptrtoint ptr [[A]] to i64
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; CHECK-NEXT: [[B2:%.*]] = ptrtoint ptr [[B]] to i64
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; CHECK-NEXT: [[C3:%.*]] = ptrtoint ptr [[C]] to i64
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; CHECK-NEXT: [[TMP0:%.*]] = sub i64 [[A1]], [[B2]]
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; CHECK-NEXT: [[DIFF_CHECK:%.*]] = icmp ult i64 [[TMP0]], 16
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; CHECK-NEXT: [[TMP1:%.*]] = sub i64 [[A1]], [[C3]]
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; CHECK-NEXT: [[DIFF_CHECK4:%.*]] = icmp ult i64 [[TMP1]], 16
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; CHECK-NEXT: [[CONFLICT_RDX:%.*]] = or i1 [[DIFF_CHECK]], [[DIFF_CHECK4]]
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; CHECK-NEXT: br i1 [[CONFLICT_RDX]], [[SCALAR_PH:label %.*]], label %[[VECTOR_PH:.*]]
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; CHECK: [[VECTOR_PH]]:
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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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%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
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%arrayidx = getelementptr inbounds i32, ptr %B, i64 %iv
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%0 = load i32, ptr %arrayidx, align 4
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%arrayidx2 = getelementptr inbounds i32, ptr %C, i64 %iv
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%1 = load i32, ptr %arrayidx2, align 4
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%add = add nsw i32 %1, %0
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%arrayidx4 = getelementptr inbounds i32, ptr %A, i64 %iv
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store i32 %add, ptr %arrayidx4, align 4
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%iv.next = add i64 %iv, 1
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%iv.trunc = trunc i64 %iv.next to i32
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%exitcond = icmp eq i32 %iv.trunc, 200
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br i1 %exitcond, label %exit, label %loop
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exit:
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ret void
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}
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