[MBP] Fix a really horrible bug in MachineBlockPlacement, but behind

[oota-llvm.git] / test / CodeGen / X86 / avoid_complex_am.ll

diff --git a/test/CodeGen/X86/avoid_complex_am.ll b/test/CodeGen/X86/avoid_complex_am.ll
index 0b7a13d3c0919302552d2509f030a19c7fe64f3c..fafa236b8dd4dd332f3ca69585b1d17533626566 100644 (file)
--- a/test/CodeGen/X86/avoid_complex_am.ll
+++ b/test/CodeGen/X86/avoid_complex_am.ll
@@ -1,6 +1,9 @@
 ; 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"
@@ -16,19 +19,19 @@ for.body:                                         ; preds = %for.body, %entry
 ; 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
+  %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* %c, i64 %indvars.iv.next
-  %tmp2 = load double* %arrayidx2, align 8
+  %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* %a, i64 %indvars.iv
+  %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 * 8 = 152.
-; CHECK: icmp eq i32 {{%[^,]+}}, 152
+; 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