| ; RUN: opt < %s -passes=loop-vectorize,dce,instcombine -force-vector-width=1 -force-target-num-scalar-regs=16 -force-target-max-scalar-interleave=8 -force-target-instruction-cost=1 -small-loop-cost=40 -S | FileCheck %s |
| |
| 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" |
| |
| @a = common global [2048 x i32] zeroinitializer, align 16 |
| |
| ; This is the loop. |
| ; for (i=0; i<n; i++){ |
| ; a[i] += i; |
| ; } |
| ;CHECK-LABEL: @inc( |
| ;CHECK: load i32, ptr |
| ;CHECK: load i32, ptr |
| ;CHECK: load i32, ptr |
| ;CHECK: load i32, ptr |
| ;CHECK-NOT: load i32, ptr |
| ;CHECK: add nsw i32 |
| ;CHECK: add nsw i32 |
| ;CHECK: add nsw i32 |
| ;CHECK: add nsw i32 |
| ;CHECK-NOT: add nsw i32 |
| ;CHECK: store i32 |
| ;CHECK: store i32 |
| ;CHECK: store i32 |
| ;CHECK: store i32 |
| ;CHECK-NOT: store i32 |
| ;CHECK: add nuw i64 %{{.*}}, 4 |
| ;CHECK: ret void |
| define void @inc(i32 %n) nounwind uwtable noinline ssp { |
| %1 = icmp sgt i32 %n, 0 |
| br i1 %1, label %.lr.ph, label %._crit_edge |
| |
| .lr.ph: ; preds = %0, %.lr.ph |
| %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ] |
| %2 = getelementptr inbounds [2048 x i32], ptr @a, i64 0, i64 %indvars.iv |
| %3 = load i32, ptr %2, align 4 |
| %4 = trunc i64 %indvars.iv to i32 |
| %5 = add nsw i32 %3, %4 |
| store i32 %5, ptr %2, align 4 |
| %indvars.iv.next = add i64 %indvars.iv, 1 |
| %lftr.wideiv = trunc i64 %indvars.iv.next to i32 |
| %exitcond = icmp eq i32 %lftr.wideiv, %n |
| br i1 %exitcond, label %._crit_edge, label %.lr.ph |
| |
| ._crit_edge: ; preds = %.lr.ph, %0 |
| ret void |
| } |
| |
