| ; RUN: opt -analyze -scalar-evolution < %s | FileCheck %s | |
| ; CHECK: Loop %bb1: backedge-taken count is ((2 * %a.promoted) /u 2) | |
| target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" | |
| target triple = "x86_64-apple-macosx10.10.0" | |
| @a = global i8 -127, align 1 | |
| @b = common global i32 0, align 4 | |
| declare void @use(i32) | |
| define i32 @main() { | |
| bb: | |
| %a.promoted = load i8, i8* @a | |
| br label %bb1 | |
| bb1: ; preds = %bb1, %bb | |
| %tmp = phi i8 [ %tmp2, %bb1 ], [ %a.promoted, %bb ] | |
| %tmp2 = add i8 %tmp, -1 | |
| %tmp3 = sext i8 %tmp to i32 | |
| %tmp4 = xor i32 %tmp3, -1 | |
| %tmp5 = sext i8 %tmp2 to i32 | |
| %tmpf = sub nsw i32 %tmp4, %tmp5 | |
| %tmp6 = trunc i32 %tmpf to i8 | |
| %tmp7 = icmp eq i8 %tmp6, 0 | |
| br i1 %tmp7, label %bb8, label %bb1 | |
| bb8: ; preds = %bb1 | |
| store i8 %tmp2, i8* @a | |
| store i32 %tmp4, i32* @b | |
| %tmp9 = sext i8 %tmp2 to i32 | |
| call void @use(i32 %tmp9) | |
| ret i32 0 | |
| } |