From: Nadav Rotem <nrotem@apple.com>
Date: Wed, 5 Dec 2012 21:21:26 +0000 (+0000)
Subject: Cost Model: change the default cost of control flow instructions (br / ret / ...... 
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0602bb46596485b43fa8b86abbc8485d502025ce;p=oota-llvm.git

Cost Model: change the default cost of control flow instructions (br / ret / ...) to zero.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169423 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/TargetTransformImpl.cpp b/lib/Target/TargetTransformImpl.cpp
index b36e6f858f7..2df72630bb3 100644
--- a/lib/Target/TargetTransformImpl.cpp
+++ b/lib/Target/TargetTransformImpl.cpp
@@ -283,7 +283,7 @@ unsigned VectorTargetTransformImpl::getCastInstrCost(unsigned Opcode, Type *Dst,
  }
 
 unsigned VectorTargetTransformImpl::getCFInstrCost(unsigned Opcode) const {
-  return 1;
+  return 0;
 }
 
 unsigned VectorTargetTransformImpl::getCmpSelInstrCost(unsigned Opcode,
diff --git a/test/Analysis/CostModel/X86/arith.ll b/test/Analysis/CostModel/X86/arith.ll
index 37cca8d5406..ae78d44aeb4 100644
--- a/test/Analysis/CostModel/X86/arith.ll
+++ b/test/Analysis/CostModel/X86/arith.ll
@@ -14,7 +14,7 @@ define i32 @add(i32 %arg) {
   %D = add <4 x i64> undef, undef
   ;CHECK: cost of 8 {{.*}} add
   %E = add <8 x i64> undef, undef
-  ;CHECK: cost of 1 {{.*}} ret
+  ;CHECK: cost of 0 {{.*}} ret
   ret i32 undef
 }
 
@@ -28,7 +28,7 @@ define i32 @xor(i32 %arg) {
   %C = xor <2 x i64> undef, undef
   ;CHECK: cost of 1 {{.*}} xor
   %D = xor <4 x i64> undef, undef
-  ;CHECK: cost of 1 {{.*}} ret
+  ;CHECK: cost of 0 {{.*}} ret
   ret i32 undef
 }
 
diff --git a/test/Analysis/CostModel/X86/cast.ll b/test/Analysis/CostModel/X86/cast.ll
index 75c97a781e7..cedc6825988 100644
--- a/test/Analysis/CostModel/X86/cast.ll
+++ b/test/Analysis/CostModel/X86/cast.ll
@@ -28,7 +28,7 @@ define i32 @add(i32 %arg) {
   ;CHECK: cost of 0 {{.*}} trunc
   %H = trunc i32 undef to i1
 
-  ;CHECK: cost of 1 {{.*}} ret
+  ;CHECK: cost of 0 {{.*}} ret
   ret i32 undef
 }
 
diff --git a/test/Analysis/CostModel/X86/cmp.ll b/test/Analysis/CostModel/X86/cmp.ll
index f868bd18b54..90b09c1154e 100644
--- a/test/Analysis/CostModel/X86/cmp.ll
+++ b/test/Analysis/CostModel/X86/cmp.ll
@@ -35,7 +35,7 @@ define i32 @cmp(i32 %arg) {
   ;CHECK: cost of 4 {{.*}} icmp
   %M = icmp eq <32 x i8> undef, undef
 
-  ;CHECK: cost of 1 {{.*}} ret
+  ;CHECK: cost of 0 {{.*}} ret
   ret i32 undef
 }
 
diff --git a/test/Analysis/CostModel/X86/i32.ll b/test/Analysis/CostModel/X86/i32.ll
index 4015e0b1eef..52c295934c7 100644
--- a/test/Analysis/CostModel/X86/i32.ll
+++ b/test/Analysis/CostModel/X86/i32.ll
@@ -2,7 +2,7 @@
 
 
 ;CHECK: cost of 2 {{.*}} add
-;CHECK: cost of 1 {{.*}} ret
+;CHECK: cost of 0 {{.*}} ret
 define i32 @no_info(i32 %arg) {
   %e = add i64 undef, undef
   ret i32 undef
diff --git a/test/Analysis/CostModel/X86/tiny.ll b/test/Analysis/CostModel/X86/tiny.ll
index cc7b443a7df..0dafdadb5b1 100644
--- a/test/Analysis/CostModel/X86/tiny.ll
+++ b/test/Analysis/CostModel/X86/tiny.ll
@@ -4,7 +4,7 @@ target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f3
 target triple = "x86_64-apple-macosx10.8.0"
 
 ;CHECK: cost of 1 {{.*}} add
-;CHECK: cost of 1 {{.*}} ret
+;CHECK: cost of 0 {{.*}} ret
 define i32 @no_info(i32 %arg) {
   %e = add i32 %arg, %arg
   ret i32 %e
diff --git a/test/Analysis/CostModel/X86/vectorized-loop.ll b/test/Analysis/CostModel/X86/vectorized-loop.ll
index 7919a9ca9a6..6c9e111bb10 100644
--- a/test/Analysis/CostModel/X86/vectorized-loop.ll
+++ b/test/Analysis/CostModel/X86/vectorized-loop.ll
@@ -41,7 +41,7 @@ vector.body:                                      ; preds = %for.body.lr.ph, %ve
   store <8 x i32> %11, <8 x i32>* %9, align 4
   %index.next = add i64 %index, 8
   %12 = icmp eq i64 %index.next, %end.idx.rnd.down
-  ;CHECK: cost of 1 {{.*}} br
+  ;CHECK: cost of 0 {{.*}} br
   br i1 %12, label %middle.block, label %vector.body
 
 middle.block:                                     ; preds = %vector.body, %for.body.lr.ph
@@ -65,11 +65,11 @@ for.body:                                         ; preds = %middle.block, %for.
   ;CHECK: cost of 0 {{.*}} trunc
   %16 = trunc i64 %indvars.iv.next to i32
   %cmp = icmp slt i32 %16, %end
-  ;CHECK: cost of 1 {{.*}} br
+  ;CHECK: cost of 0 {{.*}} br
   br i1 %cmp, label %for.body, label %for.end
 
 for.end:                                          ; preds = %middle.block, %for.body, %entry
-  ;CHECK: cost of 1 {{.*}} ret
+  ;CHECK: cost of 0 {{.*}} ret
   ret i32 undef
 }