File: 2008-12-08-FiniteSGE.ll

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llvm-toolchain-14 1%3A14.0.6-12
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; RUN: opt < %s -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s

; CHECK: backedge-taken count is 255

define i32 @foo(i32 %x, i32 %y, i32* %lam, i32* %alp) nounwind {
bb1.thread:
	br label %bb1

bb1:		; preds = %bb1, %bb1.thread
	%indvar = phi i32 [ 0, %bb1.thread ], [ %indvar.next, %bb1 ]		; <i32> [#uses=4]
	%i.0.reg2mem.0 = sub i32 255, %indvar		; <i32> [#uses=2]
	%0 = getelementptr i32, i32* %alp, i32 %i.0.reg2mem.0		; <i32*> [#uses=1]
	%1 = load i32, i32* %0, align 4		; <i32> [#uses=1]
	%2 = getelementptr i32, i32* %lam, i32 %i.0.reg2mem.0		; <i32*> [#uses=1]
	store i32 %1, i32* %2, align 4
	%3 = sub i32 254, %indvar		; <i32> [#uses=1]
	%4 = icmp slt i32 %3, 0		; <i1> [#uses=1]
	%indvar.next = add i32 %indvar, 1		; <i32> [#uses=1]
	br i1 %4, label %bb2, label %bb1

bb2:		; preds = %bb1
	%tmp10 = mul i32 %indvar, %x		; <i32> [#uses=1]
	%z.0.reg2mem.0 = add i32 %tmp10, %y		; <i32> [#uses=1]
	%5 = add i32 %z.0.reg2mem.0, %x		; <i32> [#uses=1]
	ret i32 %5
}