1 ; RUN: opt < %s -passes=indvars -S | FileCheck %s
3 ; This loop has backedge-taken-count zero. Indvars shouldn't expand any
4 ; instructions to compute a trip count.
6 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
7 target triple = "i386-pc-linux-gnu"
9 define ptr @string_expandtabs() nounwind {
10 ; CHECK-LABEL: @string_expandtabs(
13 br i1 undef, label %bb33, label %bb1
16 br i1 undef, label %overflow1, label %bb15
19 br i1 undef, label %bb33, label %bb17
25 br i1 undef, label %bb20, label %bb29
28 %0 = load i32, ptr undef, align 4 ; <i32> [#uses=1]
29 %1 = sub i32 %0, undef ; <i32> [#uses=1]
33 %2 = icmp ult ptr %q.0, undef ; <i1> [#uses=1]
34 br i1 %2, label %bb22, label %overflow2
37 %3 = getelementptr i8, ptr %q.0, i32 1 ; <ptr> [#uses=1]
40 bb23: ; preds = %bb22, %bb20
41 %i.2 = phi i32 [ %1, %bb20 ], [ %4, %bb22 ] ; <i32> [#uses=1]
42 %q.0 = phi ptr [ undef, %bb20 ], [ %3, %bb22 ] ; <ptr> [#uses=3]
43 %4 = add i32 %i.2, -1 ; <i32> [#uses=2]
44 %5 = icmp eq i32 %4, -1 ; <i1> [#uses=1]
45 br i1 %5, label %bb29, label %bb21
47 bb29: ; preds = %bb23, %bb19
48 %q.1 = phi ptr [ undef, %bb19 ], [ %q.0, %bb23 ] ; <ptr> [#uses=0]
51 bb30: ; preds = %bb29, %bb17
52 br i1 undef, label %bb19, label %bb33
54 overflow2: ; preds = %bb21
55 br i1 undef, label %bb32, label %overflow1
57 bb32: ; preds = %overflow2
60 overflow1: ; preds = %bb32, %overflow2, %bb1
63 bb33: ; preds = %bb30, %bb15, %entry