forked from OSchip/llvm-project
52 lines
1.6 KiB
LLVM
52 lines
1.6 KiB
LLVM
; RUN: opt < %s -indvars -S | FileCheck %s
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;
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; Make sure IndVars preserves LCSSA form, especially across loop nests.
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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"
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define void @PR18642(i32 %x) {
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; CHECK-LABEL: @PR18642(
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entry:
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br label %outer.header
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; CHECK: br label %outer.header
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outer.header:
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; CHECK: outer.header:
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%outer.iv = phi i32 [ 0, %entry ], [ %x, %outer.latch ]
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br label %inner.header
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; CHECK: %[[SCEV_EXPANDED:.*]] = add i32
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; CHECK: br label %inner.header
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inner.header:
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; CHECK: inner.header:
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%inner.iv = phi i32 [ undef, %outer.header ], [ %inc, %inner.latch ]
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%cmp1 = icmp slt i32 %inner.iv, %outer.iv
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br i1 %cmp1, label %inner.latch, label %outer.latch
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; CHECK: br i1 {{.*}}, label %inner.latch, label %outer.latch
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inner.latch:
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; CHECK: inner.latch:
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%inc = add nsw i32 %inner.iv, 1
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%cmp2 = icmp slt i32 %inner.iv, %outer.iv
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br i1 %cmp2, label %inner.header, label %exit
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; CHECK: br i1 {{.*}}, label %inner.header, label %[[EXIT_FROM_INNER:.*]]
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outer.latch:
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; CHECK: outer.latch:
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br i1 undef, label %outer.header, label %exit
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; CHECK: br i1 {{.*}}, label %outer.header, label %[[EXIT_FROM_OUTER:.*]]
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; CHECK: [[EXIT_FROM_INNER]]:
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; CHECK-NEXT: %[[LCSSA:.*]] = phi i32 [ %[[SCEV_EXPANDED]], %inner.latch ]
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; CHECK-NEXT: br label %exit
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; CHECK: [[EXIT_FROM_OUTER]]:
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; CHECK-NEXT: br label %exit
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exit:
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; CHECK: exit:
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%exit.phi = phi i32 [ %inc, %inner.latch ], [ undef, %outer.latch ]
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; CHECK-NEXT: phi i32 [ %[[LCSSA]], %[[EXIT_FROM_INNER]] ], [ undef, %[[EXIT_FROM_OUTER]] ]
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ret void
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}
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