llvm-for-llvmta/test/Analysis/ScalarEvolution/2008-12-08-FiniteSGE.ll

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2022-04-25 10:02:23 +02:00
; RUN: opt < %s -analyze -enable-new-pm=0 -scalar-evolution | FileCheck %s
; 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
}