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
64 lines
3.4 KiB
LLVM
64 lines
3.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; Check remark analysis runs successfully.
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; TODO: Remove this test when we fully migrate to VPlan-based cost model.
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; RUN: opt < %s -passes=loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -prefer-inloop-reductions -pass-remarks-analysis=loop-vectorize -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 i32 @reduction_sum(ptr noalias nocapture %A, ptr noalias nocapture %B) {
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; CHECK-LABEL: define i32 @reduction_sum(
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; CHECK-SAME: ptr noalias captures(none) [[A:%.*]], ptr noalias captures(none) [[B:%.*]]) {
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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_PHI:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[TMP4:%.*]], %[[VECTOR_BODY]] ]
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; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[INDEX]]
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; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP1]], align 4
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; CHECK-NEXT: [[TMP3:%.*]] = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> [[WIDE_LOAD]])
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; CHECK-NEXT: [[TMP4]] = add i32 [[VEC_PHI]], [[TMP3]]
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
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; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i64 [[INDEX_NEXT]], 256
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; CHECK-NEXT: br i1 [[TMP5]], 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 %[[BODY:.*]]
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; CHECK: [[BODY]]:
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; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], %[[BODY]] ], [ 0, %[[SCALAR_PH]] ]
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; CHECK-NEXT: [[SUM_TMP:%.*]] = phi i32 [ [[SUM:%.*]], %[[BODY]] ], [ 0, %[[SCALAR_PH]] ]
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; CHECK-NEXT: [[GEP0:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[INDVARS_IV]]
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; CHECK-NEXT: [[LOAD0:%.*]] = load i32, ptr [[GEP0]], align 4
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; CHECK-NEXT: [[SUM]] = add i32 [[SUM_TMP]], [[LOAD0]]
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; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add i64 [[INDVARS_IV]], 1
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; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], 256
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; CHECK-NEXT: br i1 [[EXITCOND]], label %[[EXIT]], label %[[BODY]]
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; CHECK: [[EXIT]]:
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; CHECK-NEXT: [[SUM_0_LCSSA:%.*]] = phi i32 [ [[SUM]], %[[BODY]] ], [ [[TMP4]], %[[MIDDLE_BLOCK]] ]
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; CHECK-NEXT: ret i32 [[SUM_0_LCSSA]]
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;
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entry:
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br label %body
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body: ; preds = %entry, %body
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%indvars.iv = phi i64 [ %indvars.iv.next, %body ], [ 0, %entry ]
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%sum.tmp = phi i32 [ %sum, %body ], [ 0, %entry ]
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%gep0 = getelementptr inbounds i32, ptr %A, i64 %indvars.iv
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%load0 = load i32, ptr %gep0, align 4
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%sum = add i32 %sum.tmp, %load0
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%indvars.iv.next = add i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, 256
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br i1 %exitcond, label %exit, label %body
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exit: ; preds = %body
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%sum.0.lcssa = phi i32 [ %sum, %body ]
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ret i32 %sum.0.lcssa
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}
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;.
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; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]], [[META2:![0-9]+]]}
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; CHECK: [[META1]] = !{!"llvm.loop.isvectorized", i32 1}
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; CHECK: [[META2]] = !{!"llvm.loop.unroll.runtime.disable"}
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;.
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