blob: 9cd6365453c92783e591f31d9090c3772acf8b87 [file] [log] [blame]
Quentin Colombet35109902017-01-28 01:05:27 +00001; RUN: llc -regalloc=greedy -mtriple=x86_64-unknown-linux-gnu < %s -o - | FileCheck %s
2;
3; The test is to check no redundent mov as follows will be generated in %while.body loop.
4; .LBB0_2:
5; movsbl %cl, %ecx
6; movl %edx, %eax ==> This movl can be promoted outside of loop.
7; shll $5, %eax
8; ...
9; movl %eax, %edx
10; jne .LBB0_2
11;
12; CHECK-LABEL: foo:
13; CHECK: [[L0:.LBB0_[0-9]+]]: # %while.body
14; CHECK: movl %[[REGA:.*]], %[[REGB:.*]]
15; CHECK-NOT: movl %[[REGB]], %[[REGA]]
16; CHECK: jne [[L0]]
17;
18target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
19
20@b = common local_unnamed_addr global i8* null, align 8
21@a = common local_unnamed_addr global i32 0, align 4
22
23define i32 @foo() local_unnamed_addr {
24entry:
25 %t0 = load i8*, i8** @b, align 8
26 %t1 = load i8, i8* %t0, align 1
27 %cmp4 = icmp eq i8 %t1, 0
28 %t2 = load i32, i32* @a, align 4
29 br i1 %cmp4, label %while.end, label %while.body.preheader
30
31while.body.preheader: ; preds = %entry
32 br label %while.body
33
34while.body: ; preds = %while.body.preheader, %while.body
35 %t3 = phi i32 [ %add3, %while.body ], [ %t2, %while.body.preheader ]
36 %t4 = phi i8 [ %t5, %while.body ], [ %t1, %while.body.preheader ]
37 %conv = sext i8 %t4 to i32
38 %add = mul i32 %t3, 33
39 %add3 = add nsw i32 %add, %conv
40 store i32 %add3, i32* @a, align 4
41 %t5 = load i8, i8* %t0, align 1
42 %cmp = icmp eq i8 %t5, 0
43 br i1 %cmp, label %while.end.loopexit, label %while.body
44
45while.end.loopexit: ; preds = %while.body
46 br label %while.end
47
48while.end: ; preds = %while.end.loopexit, %entry
49 %.lcssa = phi i32 [ %t2, %entry ], [ %add3, %while.end.loopexit ]
50 ret i32 %.lcssa
51}