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