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
72 lines
3.5 KiB
LLVM
72 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
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; RUN: opt < %s -passes=loop-vectorize -mtriple loongarch64-linux-gnu -mattr=+lasx -S | FileCheck %s
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;; This is a collection of tests whose only purpose is to show changes in the
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;; default configuration. Please keep these tests minimal - if you're testing
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;; functionality of some specific configuration, please place that in a
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;; separate test file with a hard coded configuration (even if that
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;; configuration is the current default).
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target datalayout = "e-m:e-p:64:64-i64:64-i128:128-n64-S128"
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target triple = "loongarch64"
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define void @vector_add(ptr noalias nocapture %a, i64 %v) {
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; CHECK-LABEL: define void @vector_add(
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; CHECK-SAME: ptr noalias captures(none) [[A:%.*]], i64 [[V:%.*]]) #[[ATTR0:[0-9]+]] {
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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: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i64> poison, i64 [[V]], i64 0
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; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i64> [[BROADCAST_SPLATINSERT]], <4 x i64> poison, <4 x i32> zeroinitializer
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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: [[TMP2:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[INDEX]]
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; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i64, ptr [[TMP2]], i32 4
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; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i64>, ptr [[TMP2]], align 8
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; CHECK-NEXT: [[WIDE_LOAD1:%.*]] = load <4 x i64>, ptr [[TMP5]], align 8
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; CHECK-NEXT: [[TMP6:%.*]] = add <4 x i64> [[WIDE_LOAD]], [[BROADCAST_SPLAT]]
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; CHECK-NEXT: [[TMP7:%.*]] = add <4 x i64> [[WIDE_LOAD1]], [[BROADCAST_SPLAT]]
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; CHECK-NEXT: store <4 x i64> [[TMP6]], ptr [[TMP2]], align 8
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; CHECK-NEXT: store <4 x i64> [[TMP7]], ptr [[TMP5]], align 8
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
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; CHECK-NEXT: [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
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; CHECK-NEXT: br i1 [[TMP8]], 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: [[IV:%.*]] = phi i64 [ 0, [[SCALAR_PH:%.*]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
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; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[IV]]
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; CHECK-NEXT: [[ELEM:%.*]] = load i64, ptr [[ARRAYIDX]], align 8
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; CHECK-NEXT: [[ADD:%.*]] = add i64 [[ELEM]], [[V]]
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; CHECK-NEXT: store i64 [[ADD]], ptr [[ARRAYIDX]], align 8
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; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
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; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], 1024
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; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_END]], label [[FOR_BODY]]
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; CHECK: for.end:
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; CHECK-NEXT: ret void
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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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%iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
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%arrayidx = getelementptr inbounds i64, ptr %a, i64 %iv
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%elem = load i64, ptr %arrayidx
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%add = add i64 %elem, %v
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store i64 %add, ptr %arrayidx
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%iv.next = add nuw nsw i64 %iv, 1
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%exitcond.not = icmp eq i64 %iv.next, 1024
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br i1 %exitcond.not, label %for.end, label %for.body
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for.end:
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ret void
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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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