37 lines
1.0 KiB
LLVM
37 lines
1.0 KiB
LLVM
; RUN: opt -analyze -enable-new-pm=0 -scalar-evolution < %s | FileCheck %s
|
|
; RUN: opt -disable-output "-passes=print<scalar-evolution>" < %s 2>&1 | 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
|
|
}
|