40 lines
1.4 KiB
LLVM
40 lines
1.4 KiB
LLVM
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; RUN: opt < %s -loop-unroll -unroll-runtime -unroll-count=2 -verify-scev-maps -S | FileCheck %s
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; Check SCEV expansion uses existing value when unrolling an inner loop with runtime trip count in a loop nest.
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; The outer loop gets unrolled twice, so we see 2 selects in the outer loop blocks.
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; CHECK-LABEL: @foo(
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; CHECK-LABEL: for.body.loopexit:
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; CHECK: select
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; CHECK-LABEL: for.body:
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; CHECK: select
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; CHECK-NOT: select
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; CHECK: ret
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define void @foo(i32 %xfL, i32 %scaleL) local_unnamed_addr {
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entry:
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br label %for.body
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for.body: ; preds = %for.body5, %for.body, %entry
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%xfL.addr.033 = phi i32 [ %xfL, %entry ], [ %add, %for.body5 ]
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%add = add nsw i32 %xfL.addr.033, %scaleL
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%shr = ashr i32 %add, 16
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%cmp.i = icmp slt i32 10, %shr
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%.sroa.speculated = select i1 %cmp.i, i32 0, i32 %shr
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%cmp425 = icmp slt i32 0, %.sroa.speculated
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br i1 %cmp425, label %for.body5.preheader, label %for.end
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for.body5.preheader: ; preds = %for.body
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%tmp0 = sext i32 %.sroa.speculated to i64
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br label %for.body5
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for.body5: ; preds = %for.body5, %for.body5.preheader
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%indvars.iv = phi i64 [ 0, %for.body5.preheader ], [ %indvars.iv.next, %for.body5 ]
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%indvars.iv.next = add nsw i64 %indvars.iv, 1
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%cmp4 = icmp slt i64 %indvars.iv.next, %tmp0
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br i1 %cmp4, label %for.body5, label %for.body
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for.end:
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ret void
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}
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