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
157 lines
7.5 KiB
LLVM
157 lines
7.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --filter "br" --filter "^.*:"
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; RUN: opt -passes="print<block-freq>,loop-vectorize" -force-vector-width=4 -force-vector-interleave=1 -S < %s | FileCheck %s
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; RUN: opt -passes="print<block-freq>,loop-vectorize" -force-vector-width=4 -force-vector-interleave=4 -S < %s | FileCheck %s -check-prefix=CHECK-MASKED
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; RUN: opt -passes="print<block-freq>,loop-vectorize" -force-vector-width=4 -force-vector-interleave=1 \
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; RUN: -scalable-vectorization=on -force-target-supports-scalable-vectors -S < %s | FileCheck %s -check-prefix=CHECK-SCALABLE
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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@a = global [1024 x i32] zeroinitializer, align 16
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@b = global [1024 x i32] zeroinitializer, align 16
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; Check correctness of profile info for vectorization without epilog.
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define void @_Z3foov() {
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; CHECK-LABEL: @_Z3foov(
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; CHECK: entry:
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; CHECK: br label [[VECTOR_PH:%.*]]
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; CHECK: vector.ph:
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; CHECK: br label [[VECTOR_BODY:%.*]]
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; CHECK: vector.body:
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; CHECK: br i1 [[TMP6:%.*]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !prof [[PROF1:![0-9]+]], !llvm.loop [[LOOP2:![0-9]+]]
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; CHECK: middle.block:
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; CHECK: br label [[FOR_COND_CLEANUP:%.*]]
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; CHECK: scalar.ph:
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; CHECK: br label [[FOR_BODY:%.*]]
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; CHECK: for.cond.cleanup:
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; CHECK: for.body:
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; CHECK: br i1 [[EXITCOND:%.*]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !prof [[PROF5:![0-9]+]]
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;
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; CHECK-MASKED-LABEL: @_Z3foov(
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; CHECK-MASKED: entry:
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; CHECK-MASKED: br label [[VECTOR_PH:%.*]]
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; CHECK-MASKED: vector.ph:
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; CHECK-MASKED: br label [[VECTOR_BODY:%.*]]
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; CHECK-MASKED: vector.body:
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; CHECK-MASKED: br i1 [[TMP18:%.*]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !prof [[PROF1:![0-9]+]], !llvm.loop [[LOOP2:![0-9]+]]
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; CHECK-MASKED: middle.block:
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; CHECK-MASKED: br label [[FOR_COND_CLEANUP:%.*]]
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; CHECK-MASKED: scalar.ph:
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; CHECK-MASKED: br label [[FOR_BODY:%.*]]
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; CHECK-MASKED: for.cond.cleanup:
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; CHECK-MASKED: for.body:
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; CHECK-MASKED: br i1 [[EXITCOND:%.*]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !prof [[PROF5:![0-9]+]]
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;
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; CHECK-SCALABLE-LABEL: @_Z3foov(
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; CHECK-SCALABLE: entry:
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; CHECK-SCALABLE: br i1 [[MIN_ITERS_CHECK:%.*]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]], !prof [[PROF0:![0-9]+]]
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; CHECK-SCALABLE: vector.ph:
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; CHECK-SCALABLE: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <vscale x 4 x i32> poison, i32 [[TMP9:%.*]], i64 0
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; CHECK-SCALABLE: [[BROADCAST_SPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[BROADCAST_SPLATINSERT]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK-SCALABLE: br label [[VECTOR_BODY:%.*]]
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; CHECK-SCALABLE: vector.body:
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; CHECK-SCALABLE: [[VEC_IND_NEXT:%.*]] = add <vscale x 4 x i32> [[VEC_IND:%.*]], [[BROADCAST_SPLAT]]
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; CHECK-SCALABLE: br i1 [[TMP16:%.*]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !prof [[PROF1:![0-9]+]], !llvm.loop [[LOOP2:![0-9]+]]
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; CHECK-SCALABLE: middle.block:
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; CHECK-SCALABLE: br i1 [[CMP_N:%.*]], label [[FOR_COND_CLEANUP:%.*]], label [[SCALAR_PH]], !prof [[PROF5:![0-9]+]]
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; CHECK-SCALABLE: scalar.ph:
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; CHECK-SCALABLE: br label [[FOR_BODY:%.*]]
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; CHECK-SCALABLE: for.cond.cleanup:
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; CHECK-SCALABLE: for.body:
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; CHECK-SCALABLE: br i1 [[EXITCOND:%.*]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !prof [[PROF6:![0-9]+]], !llvm.loop [[LOOP7:![0-9]+]]
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;
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entry:
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br label %for.body
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for.cond.cleanup: ; preds = %for.body
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ret void
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for.body: ; preds = %for.body, %entry
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%iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
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%arrayidx = getelementptr inbounds [1024 x i32], ptr @b, i64 0, i64 %iv
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%0 = load i32, ptr %arrayidx, align 4
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%1 = trunc i64 %iv to i32
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%mul = mul nsw i32 %0, %1
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%arrayidx2 = getelementptr inbounds [1024 x i32], ptr @a, i64 0, i64 %iv
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%2 = load i32, ptr %arrayidx2, align 4
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%add = add nsw i32 %2, %mul
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store i32 %add, ptr %arrayidx2, align 4
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%iv.next = add nuw nsw i64 %iv, 1
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%exitcond = icmp eq i64 %iv.next, 1024
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br i1 %exitcond, label %for.cond.cleanup, label %for.body, !prof !0
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}
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; Check correctness of profile info for vectorization with epilog.
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define void @_Z3foo2v() {
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; CHECK-LABEL: @_Z3foo2v(
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; CHECK: entry:
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; CHECK: br label [[VECTOR_PH:%.*]]
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; CHECK: vector.ph:
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; CHECK: br label [[VECTOR_BODY:%.*]]
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; CHECK: vector.body:
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; CHECK: br i1 [[TMP6:%.*]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !prof [[PROF1]], !llvm.loop [[LOOP7:![0-9]+]]
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; CHECK: middle.block:
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; CHECK: br label [[SCALAR_PH:%.+]]
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; CHECK: scalar.ph:
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; CHECK: br label [[FOR_BODY:%.*]]
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; CHECK: for.cond.cleanup:
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; CHECK: for.body:
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; CHECK: br i1 [[EXITCOND:%.*]], label [[FOR_COND_CLEANUP:%.*]], label [[FOR_BODY]], !prof [[PROF8:![0-9]+]], !llvm.loop [[LOOP9:![0-9]+]]
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;
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; CHECK-MASKED-LABEL: @_Z3foo2v(
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; CHECK-MASKED: entry:
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; CHECK-MASKED: br label [[VECTOR_PH:%.*]]
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; CHECK-MASKED: vector.ph:
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; CHECK-MASKED: br label [[VECTOR_BODY:%.*]]
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; CHECK-MASKED: vector.body:
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; CHECK-MASKED: br i1 [[TMP18:%.*]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !prof [[PROF1]], !llvm.loop [[LOOP7:![0-9]+]]
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; CHECK-MASKED: middle.block:
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; CHECK-MASKED: br label [[SCALAR_PH:%.+]]
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; CHECK-MASKED: scalar.ph:
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; CHECK-MASKED: br label [[FOR_BODY:%.*]]
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; CHECK-MASKED: for.cond.cleanup:
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; CHECK-MASKED: for.body:
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; CHECK-MASKED: br i1 [[EXITCOND:%.*]], label [[FOR_COND_CLEANUP:%.*]], label [[FOR_BODY]], !prof [[PROF8:![0-9]+]], !llvm.loop [[LOOP9:![0-9]+]]
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;
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; CHECK-SCALABLE-LABEL: @_Z3foo2v(
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; CHECK-SCALABLE: entry:
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; CHECK-SCALABLE: br i1 [[MIN_ITERS_CHECK:%.*]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]], !prof [[PROF0]]
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; CHECK-SCALABLE: vector.ph:
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; CHECK-SCALABLE: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <vscale x 4 x i32> poison, i32 [[TMP9:%.*]], i64 0
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; CHECK-SCALABLE: [[BROADCAST_SPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[BROADCAST_SPLATINSERT]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK-SCALABLE: br label [[VECTOR_BODY:%.*]]
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; CHECK-SCALABLE: vector.body:
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; CHECK-SCALABLE: [[VEC_IND_NEXT:%.*]] = add <vscale x 4 x i32> [[VEC_IND:%.*]], [[BROADCAST_SPLAT]]
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; CHECK-SCALABLE: br i1 [[TMP16:%.*]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !prof [[PROF1]], !llvm.loop [[LOOP8:![0-9]+]]
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; CHECK-SCALABLE: middle.block:
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; CHECK-SCALABLE: br i1 [[CMP_N:%.*]], label [[FOR_COND_CLEANUP:%.*]], label [[SCALAR_PH]], !prof [[PROF5]]
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; CHECK-SCALABLE: scalar.ph:
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; CHECK-SCALABLE: br label [[FOR_BODY:%.*]]
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; CHECK-SCALABLE: for.cond.cleanup:
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; CHECK-SCALABLE: for.body:
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; CHECK-SCALABLE: br i1 [[EXITCOND:%.*]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !prof [[PROF9:![0-9]+]], !llvm.loop [[LOOP10:![0-9]+]]
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;
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entry:
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br label %for.body
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for.cond.cleanup: ; preds = %for.body
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ret void
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for.body: ; preds = %for.body, %entry
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%iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
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%arrayidx = getelementptr inbounds [1024 x i32], ptr @b, i64 0, i64 %iv
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%0 = load i32, ptr %arrayidx, align 4
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%1 = trunc i64 %iv to i32
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%mul = mul nsw i32 %0, %1
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%arrayidx2 = getelementptr inbounds [1024 x i32], ptr @a, i64 0, i64 %iv
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%2 = load i32, ptr %arrayidx2, align 4
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%add = add nsw i32 %2, %mul
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store i32 %add, ptr %arrayidx2, align 4
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%iv.next = add nuw nsw i64 %iv, 1
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%exitcond = icmp eq i64 %iv.next, 1027
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br i1 %exitcond, label %for.cond.cleanup, label %for.body, !prof !1
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}
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!0 = !{!"branch_weights", i32 1, i32 1023}
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!1 = !{!"branch_weights", i32 1, i32 1026}
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