1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
; RUN: opt -passes=loop-unroll -S -mtriple aarch64 -mcpu=cortex-a57 %s | FileCheck %s -check-prefix=UNROLL
; RUN: opt -passes=loop-unroll -unroll-max-upperbound=0 -S -mtriple aarch64 -mcpu=cortex-a57 %s | FileCheck %s -check-prefix=NOUNROLL
; This IR comes from this C code:
;
; for (int i = 0; i < 4; i++) {
; if (src[i] == 1) {
; *dst = i;
; break;
; }
; }
;
; This test is meant to check that this loop is unrolled into four iterations.
; Note that the load on the last iteration is dead and thus doesn't appear in
; the output.
; UNROLL-LABEL: @test
; UNROLL: load i32, ptr
; UNROLL: load i32, ptr
; UNROLL: load i32, ptr
; UNROLL-NOT: load i32, ptr
; NOUNROLL-LABEL: @test
; NOUNROLL: load i32, ptr
; NOUNROLL-NOT: load i32, ptr
define void @test(ptr %dst, ptr %src) {
entry:
br label %for.body
for.body: ; preds = %entry, %for.body
%i = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%0 = sext i32 %i to i64
%1 = getelementptr inbounds i32, ptr %src, i64 %0
%2 = load i32, ptr %1
%inc = add nsw i32 %i, 1
%cmp1 = icmp slt i32 %inc, 4
%cmp3 = icmp eq i32 %2, 1
%or.cond = and i1 %cmp3, %cmp1
br i1 %or.cond, label %for.body, label %exit
exit: ; preds = %for.body
store i32 %i, ptr %dst
ret void
}
|
