; Pin: a call to one of libgcc.s's hand-written helpers (multiply,
; divide, shift, memcpy / memmove / memset) is a JSLlight, which clobbers
; A, X, Y and $F0 only -- the helpers never touch IMG0..IMG7 ($D0..$DE).
; Values live across it stay in those words: here the pointer's high half
; stays in $D0 instead of moving to callee-saved $C0, which costs a save
; in the prologue and a restore before the return.
;
; RUN: llc -mtriple=w65816 -O2 < %s | FileCheck %s
; RUN: env W65816_DISABLE_LIGHT_CALLS=1 llc -mtriple=w65816 -O2 < %s | FileCheck %s --check-prefix=OFF

target datalayout = "e-m:e-p:32:16-i16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16"

define i16 @sumProducts(ptr %p, ptr %q, i16 %n) {
; CHECK-LABEL: sumProducts:
; CHECK-NOT:   0xc0
; CHECK:       stx 0xd0
; CHECK-NOT:   0xc0
; CHECK:       jsl __mulhi3
; CHECK-NOT:   0xc0
; CHECK:       rtl
; OFF-LABEL:   sumProducts:
; OFF:         lda 0xc0
; OFF:         stx 0xc0
; OFF:         jsl __mulhi3
; OFF:         sta 0xc0
; OFF:         rtl
entry:
  br label %loop
loop:
  %i = phi i16 [ 0, %entry ], [ %i1, %loop ]
  %s = phi i16 [ 0, %entry ], [ %s1, %loop ]
  %pa = getelementptr inbounds i16, ptr %p, i16 %i
  %qa = getelementptr inbounds i16, ptr %q, i16 %i
  %a = load i16, ptr %pa, align 2
  %b = load i16, ptr %qa, align 2
  %m = mul i16 %a, %b
  %s1 = add i16 %s, %m
  %i1 = add i16 %i, 1
  %e = icmp eq i16 %i1, %n
  br i1 %e, label %done, label %loop
done:
  ret i16 %s1
}