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39 lines
1.1 KiB
LLVM
39 lines
1.1 KiB
LLVM
; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
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@mode_table = global [4 x i32] zeroinitializer ; <[4 x i32]*> [#uses=1]
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; CHECK: max backedge-taken count is 1{{$}}
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define i8 @f() {
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entry:
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tail call i32 @fegetround( ) ; <i32>:0 [#uses=1]
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br label %bb
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bb: ; preds = %bb4, %entry
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%mode.0 = phi i8 [ 0, %entry ], [ %indvar.next, %bb4 ] ; <i8> [#uses=4]
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zext i8 %mode.0 to i32 ; <i32>:1 [#uses=1]
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getelementptr [4 x i32]* @mode_table, i32 0, i32 %1 ; <i32*>:2 [#uses=1]
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load i32* %2, align 4 ; <i32>:3 [#uses=1]
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icmp eq i32 %3, %0 ; <i1>:4 [#uses=1]
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br i1 %4, label %bb1, label %bb2
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bb1: ; preds = %bb
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ret i8 %mode.0
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bb2: ; preds = %bb
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icmp eq i8 %mode.0, 1 ; <i1>:5 [#uses=1]
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br i1 %5, label %bb5, label %bb4
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bb4: ; preds = %bb2
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%indvar.next = add i8 %mode.0, 1 ; <i8> [#uses=1]
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br label %bb
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bb5: ; preds = %bb2
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tail call void @raise_exception( ) noreturn
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unreachable
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}
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declare i32 @fegetround()
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declare void @raise_exception() noreturn
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