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f81bfefe0b
Have `getConstantEvolutionLoopExitValue` work correctly with multiple entry loops. As far as I can tell, `getConstantEvolutionLoopExitValue` never did the right thing for multiple entry loops; and before r249712 it would silently return an incorrect answer. r249712 changed SCEV to fail an assert on a multiple entry loop, and this change fixes the underlying issue. llvm-svn: 251770
79 lines
2.6 KiB
LLVM
79 lines
2.6 KiB
LLVM
; RUN: opt -analyze -scalar-evolution < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define void @hoge1() {
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; CHECK-LABEL: Classifying expressions for: @hoge1
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bb:
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br i1 undef, label %bb4, label %bb2
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bb2: ; preds = %bb2, %bb
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br i1 false, label %bb4, label %bb2
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bb3: ; preds = %bb4
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%tmp = add i32 %tmp10, -1
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br label %bb13
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bb4: ; preds = %bb4, %bb2, %bb
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%tmp5 = phi i64 [ %tmp11, %bb4 ], [ 1, %bb2 ], [ 1, %bb ]
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%tmp6 = phi i32 [ %tmp10, %bb4 ], [ 0, %bb2 ], [ 0, %bb ]
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%tmp7 = load i32, i32* undef, align 4
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%tmp8 = add i32 %tmp7, %tmp6
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%tmp9 = add i32 undef, %tmp8
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%tmp10 = add i32 undef, %tmp9
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%tmp11 = add nsw i64 %tmp5, 3
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%tmp12 = icmp eq i64 %tmp11, 64
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br i1 %tmp12, label %bb3, label %bb4
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; CHECK: Loop %bb4: backedge-taken count is 20
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; CHECK: Loop %bb4: max backedge-taken count is 20
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bb13: ; preds = %bb13, %bb3
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%tmp14 = phi i64 [ 0, %bb3 ], [ %tmp15, %bb13 ]
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%tmp15 = add nuw nsw i64 %tmp14, 1
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%tmp16 = trunc i64 %tmp15 to i32
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%tmp17 = icmp eq i32 %tmp16, %tmp
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br i1 %tmp17, label %bb18, label %bb13
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bb18: ; preds = %bb13
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ret void
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}
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define void @hoge2() {
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; CHECK-LABEL: Classifying expressions for: @hoge2
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bb:
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br i1 undef, label %bb4, label %bb2
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bb2: ; preds = %bb2, %bb
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br i1 false, label %bb4, label %bb2
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bb3: ; preds = %bb4
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%tmp = add i32 %tmp10, -1
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br label %bb13
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bb4: ; preds = %bb4, %bb2, %bb
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%tmp5 = phi i64 [ %tmp11, %bb4 ], [ 1, %bb2 ], [ 3, %bb ]
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%tmp6 = phi i32 [ %tmp10, %bb4 ], [ 0, %bb2 ], [ 0, %bb ]
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%tmp7 = load i32, i32* undef, align 4
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%tmp8 = add i32 %tmp7, %tmp6
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%tmp9 = add i32 undef, %tmp8
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%tmp10 = add i32 undef, %tmp9
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%tmp11 = add nsw i64 %tmp5, 3
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%tmp12 = icmp eq i64 %tmp11, 64
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br i1 %tmp12, label %bb3, label %bb4
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; CHECK: Loop %bb4: Unpredictable backedge-taken count.
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; CHECK: Loop %bb4: Unpredictable max backedge-taken count.
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bb13: ; preds = %bb13, %bb3
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%tmp14 = phi i64 [ 0, %bb3 ], [ %tmp15, %bb13 ]
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%tmp15 = add nuw nsw i64 %tmp14, 1
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%tmp16 = trunc i64 %tmp15 to i32
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%tmp17 = icmp eq i32 %tmp16, %tmp
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br i1 %tmp17, label %bb18, label %bb13
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bb18: ; preds = %bb13
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ret void
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}
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