Quentin Colombet | 3510990 | 2017-01-28 01:05:27 +0000 | [diff] [blame] | 1 | ; 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 | ; |
| 18 | target 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 | |
| 23 | define i32 @foo() local_unnamed_addr { |
| 24 | entry: |
| 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 | |
| 31 | while.body.preheader: ; preds = %entry |
| 32 | br label %while.body |
| 33 | |
| 34 | while.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 | |
| 45 | while.end.loopexit: ; preds = %while.body |
| 46 | br label %while.end |
| 47 | |
| 48 | while.end: ; preds = %while.end.loopexit, %entry |
| 49 | %.lcssa = phi i32 [ %t2, %entry ], [ %add3, %while.end.loopexit ] |
| 50 | ret i32 %.lcssa |
| 51 | } |