| ; RUN: opt -S -loop-reduce < %s | FileCheck %s |
| ; Complex addressing mode are costly. |
| ; Make loop-reduce prefer unscaled accesses. |
| ; On X86, reg1 + 1*reg2 has the same cost as reg1 + 8*reg2. |
| ; Therefore, LSR currently prefers to fold as much computation as possible |
| ; in the addressing mode. |
| ; <rdar://problem/16730541> |
| target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" |
| target triple = "x86_64-apple-macosx" |
| |
| define void @mulDouble(double* nocapture %a, double* nocapture %b, double* nocapture %c) { |
| ; CHECK: @mulDouble |
| entry: |
| br label %for.body |
| |
| for.body: ; preds = %for.body, %entry |
| ; CHECK: [[IV:%[^ ]+]] = phi i64 [ [[IVNEXT:%[^,]+]], %for.body ], [ 0, %entry ] |
| ; Only one induction variable should have been generated. |
| ; CHECK-NOT: phi |
| %indvars.iv = phi i64 [ 1, %entry ], [ %indvars.iv.next, %for.body ] |
| %tmp = add nsw i64 %indvars.iv, -1 |
| %arrayidx = getelementptr inbounds double, double* %b, i64 %tmp |
| %tmp1 = load double, double* %arrayidx, align 8 |
| ; The induction variable should carry the scaling factor: 1. |
| ; CHECK: [[IVNEXT]] = add nuw nsw i64 [[IV]], 1 |
| %indvars.iv.next = add i64 %indvars.iv, 1 |
| %arrayidx2 = getelementptr inbounds double, double* %c, i64 %indvars.iv.next |
| %tmp2 = load double, double* %arrayidx2, align 8 |
| %mul = fmul double %tmp1, %tmp2 |
| %arrayidx4 = getelementptr inbounds double, double* %a, i64 %indvars.iv |
| store double %mul, double* %arrayidx4, align 8 |
| %lftr.wideiv = trunc i64 %indvars.iv.next to i32 |
| ; Comparison should be 19 * 1 = 19. |
| ; CHECK: icmp eq i32 {{%[^,]+}}, 19 |
| %exitcond = icmp eq i32 %lftr.wideiv, 20 |
| br i1 %exitcond, label %for.end, label %for.body |
| |
| for.end: ; preds = %for.body |
| ret void |
| } |