38cd9acbb9
2nd part of D57095 with the same reason, just in another place. We never fold branches that are not immediately in the current loop, but this check is missing in `IsEdgeLive` As result, it may think that the edge in subloop is dead while it's live. It's a pessimization in the current stance. Differential Revision: https://reviews.llvm.org/D57147 Reviewed By: rupprecht llvm-svn: 352170
63 lines
2.2 KiB
LLVM
63 lines
2.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; REQUIRES: asserts
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; RUN: opt -S -enable-loop-simplifycfg-term-folding=true -indvars -loop-simplifycfg -debug-only=loop-simplifycfg -verify-loop-info -verify-dom-info -verify-loop-lcssa 2>&1 < %s | FileCheck %s
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; RUN: opt -S -enable-loop-simplifycfg-term-folding=true -passes='require<domtree>,loop(indvars,simplify-cfg)' -debug-only=loop-simplifycfg -verify-loop-info -verify-dom-info -verify-loop-lcssa 2>&1 < %s | FileCheck %s
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; RUN: opt -S -enable-loop-simplifycfg-term-folding=true -indvars -loop-simplifycfg -enable-mssa-loop-dependency=true -verify-memoryssa -debug-only=loop-simplifycfg -verify-loop-info -verify-dom-info -verify-loop-lcssa 2>&1 < %s | FileCheck %s
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define void @test(i1 %c) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: switch i32 0, label [[ENTRY_SPLIT:%.*]] [
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; CHECK-NEXT: i32 1, label [[DEAD_EXIT:%.*]]
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; CHECK-NEXT: ]
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; CHECK: entry-split:
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; CHECK-NEXT: br label [[OUTER:%.*]]
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; CHECK: outer:
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; CHECK-NEXT: br i1 [[C:%.*]], label [[TO_FOLD:%.*]], label [[LATCH:%.*]]
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; CHECK: to_fold:
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; CHECK-NEXT: br i1 [[C]], label [[LATCH]], label [[INNER_PREHEADER:%.*]]
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; CHECK: inner.preheader:
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; CHECK-NEXT: br label [[INNER:%.*]]
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; CHECK: inner:
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; CHECK-NEXT: br i1 false, label [[INNER_LATCH:%.*]], label [[UNDEAD:%.*]]
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; CHECK: inner_latch:
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; CHECK-NEXT: br i1 true, label [[INNER]], label [[LATCH_LOOPEXIT:%.*]]
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; CHECK: undead:
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; CHECK-NEXT: br label [[LATCH]]
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; CHECK: latch.loopexit:
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; CHECK-NEXT: br label [[LATCH]]
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; CHECK: latch:
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; CHECK-NEXT: br label [[OUTER]]
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; CHECK: dead_exit:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %outer
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outer:
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br i1 %c, label %to_fold, label %latch
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to_fold:
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br i1 %c, label %latch, label %inner
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inner:
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%iv = phi i32 [0, %to_fold], [%iv.next, %inner_latch]
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%never = icmp sgt i32 %iv, 40
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br i1 %never, label %inner_latch, label %undead
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inner_latch:
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%iv.next = add i32 %iv, 1
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%cmp = icmp slt i32 %iv.next, 10
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br i1 %cmp, label %inner, label %latch
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undead:
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br label %latch
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latch:
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br i1 true, label %outer, label %dead_exit
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dead_exit:
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ret void
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}
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