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Diffstat (limited to 'test/CodeGen/AArch64/arm64-scaled_iv.ll')
-rw-r--r-- | test/CodeGen/AArch64/arm64-scaled_iv.ll | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/test/CodeGen/AArch64/arm64-scaled_iv.ll b/test/CodeGen/AArch64/arm64-scaled_iv.ll new file mode 100644 index 0000000..987373e --- /dev/null +++ b/test/CodeGen/AArch64/arm64-scaled_iv.ll @@ -0,0 +1,38 @@ +; RUN: opt -S -loop-reduce < %s | FileCheck %s +; Scaling factor in addressing mode are costly. +; Make loop-reduce prefer unscaled accesses. +; <rdar://problem/13806271> +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-n32:64-S128" +target triple = "arm64-apple-ios7.0.0" + +; Function Attrs: nounwind ssp +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* %b, i64 %tmp + %tmp1 = load double* %arrayidx, align 8 +; The induction variable should carry the scaling factor: 1 * 8 = 8. +; CHECK: [[IVNEXT]] = add nuw nsw i64 [[IV]], 8 + %indvars.iv.next = add i64 %indvars.iv, 1 + %arrayidx2 = getelementptr inbounds double* %c, i64 %indvars.iv.next + %tmp2 = load double* %arrayidx2, align 8 + %mul = fmul double %tmp1, %tmp2 + %arrayidx4 = getelementptr inbounds 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 * 8 = 152. +; CHECK: icmp eq i32 {{%[^,]+}}, 152 + %exitcond = icmp eq i32 %lftr.wideiv, 20 + br i1 %exitcond, label %for.end, label %for.body + +for.end: ; preds = %for.body + ret void +} |