529f42331e
This is re-land of https://reviews.llvm.org/rL327362 with a fix and regression test. The crash was due to it is possible that for found MDL loop, LHS or RHS may contain an invariant unknown SCEV which does not dominate the MDL. Please see regression test for an example. Reviewers: sanjoy, mkazantsev, reames Reviewed By: mkazantsev Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D44553 llvm-svn: 327822
36 lines
850 B
LLVM
36 lines
850 B
LLVM
; RUN: opt < %s -indvars -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128-ni:1"
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target triple = "x86_64-unknown-linux-gnu"
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declare void @foo(i64)
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; CHECK-LABEL: @test
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define void @test(i64 %a) {
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entry:
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br label %outer_header
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outer_header:
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%i = phi i64 [20, %entry], [%i.next, %outer_latch]
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%i.next = add nuw nsw i64 %i, 1
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br label %inner_header
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inner_header:
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%j = phi i64 [1, %outer_header], [%j.next, %inner_header]
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%cmp = icmp ult i64 %j, %i.next
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; CHECK-NOT: select
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%s = select i1 %cmp, i64 %j, i64 %i
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; CHECK: call void @foo(i64 %j)
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call void @foo(i64 %s)
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%j.next = add nuw nsw i64 %j, 1
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%cond = icmp ult i64 %j, %i
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br i1 %cond, label %inner_header, label %outer_latch
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outer_latch:
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%cond2 = icmp ne i64 %i.next, 40
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br i1 %cond2, label %outer_header, label %return
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return:
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ret void
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}
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