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; RUN: opt < %s -loop-reduce -S | FileCheck %s
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "thumbv7m-arm-none-eabi"
; Check that the IV updates (incdec.ptr{,1,2}) are kept in the latch block
; and not moved to the header/exiting block. Inserting them in the header
; doubles register pressure and adds moves.
; CHECK-LABEL: @f
; CHECK: while.cond:
; CHECK: icmp sgt i32 %n.addr.0, 0
; CHECK: while.body:
; CHECK: incdec.ptr =
; CHECK: incdec.ptr1 =
; CHECK: incdec.ptr2 =
; CHECK: dec =
define void @f(float* nocapture readonly %a, float* nocapture readonly %b, float* nocapture %c, i32 %n) {
entry:
br label %while.cond
while.cond: ; preds = %while.body, %entry
%a.addr.0 = phi float* [ %a, %entry ], [ %incdec.ptr, %while.body ]
%b.addr.0 = phi float* [ %b, %entry ], [ %incdec.ptr1, %while.body ]
%c.addr.0 = phi float* [ %c, %entry ], [ %incdec.ptr2, %while.body ]
%n.addr.0 = phi i32 [ %n, %entry ], [ %dec, %while.body ]
%cmp = icmp sgt i32 %n.addr.0, 0
br i1 %cmp, label %while.body, label %while.end
while.body: ; preds = %while.cond
%incdec.ptr = getelementptr inbounds float, float* %a.addr.0, i32 1
%tmp = load float, float* %a.addr.0, align 4
%incdec.ptr1 = getelementptr inbounds float, float* %b.addr.0, i32 1
%tmp1 = load float, float* %b.addr.0, align 4
%add = fadd float %tmp, %tmp1
%incdec.ptr2 = getelementptr inbounds float, float* %c.addr.0, i32 1
store float %add, float* %c.addr.0, align 4
%dec = add nsw i32 %n.addr.0, -1
br label %while.cond
while.end: ; preds = %while.cond
ret void
}
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