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1; RUN: opt < %s -loop-reduce -S | FileCheck %s2 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 block7; and not moved to the header/exiting block. Inserting them in the header8; doubles register pressure and adds moves.9 10; CHECK-LABEL: @f11; CHECK: while.cond:12; CHECK: icmp sgt i32 %n.addr.0, 013; CHECK: while.body:14; CHECK: incdec.ptr =15; CHECK: incdec.ptr1 =16; CHECK: incdec.ptr2 =17; CHECK: dec = 18define void @f(ptr nocapture readonly %a, ptr nocapture readonly %b, ptr nocapture %c, i32 %n) {19entry:20 br label %while.cond21 22while.cond: ; preds = %while.body, %entry23 %a.addr.0 = phi ptr [ %a, %entry ], [ %incdec.ptr, %while.body ]24 %b.addr.0 = phi ptr [ %b, %entry ], [ %incdec.ptr1, %while.body ]25 %c.addr.0 = phi ptr [ %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, 028 br i1 %cmp, label %while.body, label %while.end29 30while.body: ; preds = %while.cond31 %incdec.ptr = getelementptr inbounds float, ptr %a.addr.0, i32 132 %tmp = load float, ptr %a.addr.0, align 433 %incdec.ptr1 = getelementptr inbounds float, ptr %b.addr.0, i32 134 %tmp1 = load float, ptr %b.addr.0, align 435 %add = fadd float %tmp, %tmp136 %incdec.ptr2 = getelementptr inbounds float, ptr %c.addr.0, i32 137 store float %add, ptr %c.addr.0, align 438 %dec = add nsw i32 %n.addr.0, -139 br label %while.cond40 41while.end: ; preds = %while.cond42 ret void43}44