1; RUN: opt < %s -loop-reduce -S | FileCheck %s
2
3target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
4target triple = "thumbv7m-arm-none-eabi"
5
6; Check that the IV updates (incdec.ptr{,1,2}) are kept in the latch block
7; and not moved to the header/exiting block. Inserting them in the header
8; doubles register pressure and adds moves.
9
10; CHECK-LABEL: @f
11; CHECK: while.cond:
12; CHECK: icmp sgt i32 %n.addr.0, 0
13; CHECK: while.body:
14; CHECK: incdec.ptr =
15; CHECK: incdec.ptr1 =
16; CHECK: incdec.ptr2 =
17; CHECK: dec =
18define void @f(float* nocapture readonly %a, float* nocapture readonly %b, float* nocapture %c, i32 %n) {
19entry:
20  br label %while.cond
21
22while.cond:                                       ; preds = %while.body, %entry
23  %a.addr.0 = phi float* [ %a, %entry ], [ %incdec.ptr, %while.body ]
24  %b.addr.0 = phi float* [ %b, %entry ], [ %incdec.ptr1, %while.body ]
25  %c.addr.0 = phi float* [ %c, %entry ], [ %incdec.ptr2, %while.body ]
26  %n.addr.0 = phi i32 [ %n, %entry ], [ %dec, %while.body ]
27  %cmp = icmp sgt i32 %n.addr.0, 0
28  br i1 %cmp, label %while.body, label %while.end
29
30while.body:                                       ; preds = %while.cond
31  %incdec.ptr = getelementptr inbounds float, float* %a.addr.0, i32 1
32  %tmp = load float, float* %a.addr.0, align 4
33  %incdec.ptr1 = getelementptr inbounds float, float* %b.addr.0, i32 1
34  %tmp1 = load float, float* %b.addr.0, align 4
35  %add = fadd float %tmp, %tmp1
36  %incdec.ptr2 = getelementptr inbounds float, float* %c.addr.0, i32 1
37  store float %add, float* %c.addr.0, align 4
38  %dec = add nsw i32 %n.addr.0, -1
39  br label %while.cond
40
41while.end:                                        ; preds = %while.cond
42  ret void
43}
44