From 0d3731478e6242cceae7c006a071b8b17f7fd298 Mon Sep 17 00:00:00 2001
From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Mon, 4 Feb 2013 15:52:32 +0000
Subject: [PATCH] Disable a couple more vector splat optimizations on PPC.

I didn't see those because the test case used "not grep". FileCheck the test and
XFAIL it, preserving the old optimization, so this can be fixed eventually.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174330 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/PowerPC/PPCISelLowering.cpp |  6 ++--
 test/CodeGen/PowerPC/vec_constants.ll  | 42 +++++++++++++++++++++++++-
 2 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index 4cd0fc484a1..5631c933a19 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -5138,14 +5138,16 @@ SDValue PPCTargetLowering::LowerBUILD_VECTOR(SDValue Op,
   // Three instruction sequences.
 
   // Odd, in range [17,31]:  (vsplti C)-(vsplti -16).
-  if (SextVal >= 0 && SextVal <= 31) {
+  // FIXME: Disabled because the add gets constant folded.
+  if (0 && SextVal >= 0 && SextVal <= 31) {
     SDValue LHS = BuildSplatI(SextVal-16, SplatSize, MVT::Other, DAG, dl);
     SDValue RHS = BuildSplatI(-16, SplatSize, MVT::Other, DAG, dl);
     LHS = DAG.getNode(ISD::SUB, dl, LHS.getValueType(), LHS, RHS);
     return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), LHS);
   }
   // Odd, in range [-31,-17]:  (vsplti C)+(vsplti -16).
-  if (SextVal >= -31 && SextVal <= 0) {
+  // FIXME: Disabled because the add gets constant folded.
+  if (0 && SextVal >= -31 && SextVal <= 0) {
     SDValue LHS = BuildSplatI(SextVal+16, SplatSize, MVT::Other, DAG, dl);
     SDValue RHS = BuildSplatI(-16, SplatSize, MVT::Other, DAG, dl);
     LHS = DAG.getNode(ISD::ADD, dl, LHS.getValueType(), LHS, RHS);
diff --git a/test/CodeGen/PowerPC/vec_constants.ll b/test/CodeGen/PowerPC/vec_constants.ll
index 399f19f8d2e..71aa35920c8 100644
--- a/test/CodeGen/PowerPC/vec_constants.ll
+++ b/test/CodeGen/PowerPC/vec_constants.ll
@@ -1,4 +1,5 @@
-; RUN: llc < %s -march=ppc32 -mcpu=g5 | not grep CPI
+; RUN: llc < %s -march=ppc32 -mcpu=g5 | FileCheck %s
+; XFAIL: *
 
 define void @test1(<4 x i32>* %P1, <4 x i32>* %P2, <4 x float>* %P3) nounwind {
 	%tmp = load <4 x i32>* %P1		; <<4 x i32>> [#uses=1]
@@ -13,32 +14,71 @@ define void @test1(<4 x i32>* %P1, <4 x i32>* %P2, <4 x float>* %P3) nounwind {
 	%tmp13 = bitcast <4 x i32> %tmp12 to <4 x float>		; <<4 x float>> [#uses=1]
 	store <4 x float> %tmp13, <4 x float>* %P3
 	ret void
+
+; CHECK: test1:
+; CHECK-NOT: CPI
 }
 
 define <4 x i32> @test_30() nounwind {
 	ret <4 x i32> < i32 30, i32 30, i32 30, i32 30 >
+
+; CHECK: test_30:
+; CHECK: vspltisw
+; CHECK-NEXT: vadduwm
+; CHECK-NEXT: blr
 }
 
 define <4 x i32> @test_29() nounwind {
 	ret <4 x i32> < i32 29, i32 29, i32 29, i32 29 >
+
+; CHECK: test_29:
+; CHECK: vspltisw
+; CHECK-NEXT: vspltisw
+; CHECK-NEXT: vsubuwm
+; CHECK-NEXT: blr
 }
 
 define <8 x i16> @test_n30() nounwind {
 	ret <8 x i16> < i16 -30, i16 -30, i16 -30, i16 -30, i16 -30, i16 -30, i16 -30, i16 -30 >
+
+; CHECK: test_n30:
+; CHECK: vspltish
+; CHECK-NEXT: vadduhm
+; CHECK-NEXT: blr
 }
 
 define <16 x i8> @test_n104() nounwind {
 	ret <16 x i8> < i8 -104, i8 -104, i8 -104, i8 -104, i8 -104, i8 -104, i8 -104, i8 -104, i8 -104, i8 -104, i8 -104, i8 -104, i8 -104, i8 -104, i8 -104, i8 -104 >
+
+; CHECK: test_n104:
+; CHECK: vspltisb
+; CHECK-NEXT: vslb
+; CHECK-NEXT: blr
 }
 
 define <4 x i32> @test_vsldoi() nounwind {
 	ret <4 x i32> < i32 512, i32 512, i32 512, i32 512 >
+
+; CHECK: test_vsldoi:
+; CHECK: vspltisw
+; CHECK-NEXT: vsldoi
+; CHECK-NEXT: blr
 }
 
 define <8 x i16> @test_vsldoi_65023() nounwind {
 	ret <8 x i16> < i16 65023, i16 65023,i16 65023,i16 65023,i16 65023,i16 65023,i16 65023,i16 65023 >
+
+; CHECK: test_vsldoi_65023:
+; CHECK: vspltish
+; CHECK-NEXT: vsldoi
+; CHECK-NEXT: blr
 }
 
 define <4 x i32> @test_rol() nounwind {
 	ret <4 x i32> < i32 -11534337, i32 -11534337, i32 -11534337, i32 -11534337 >
+
+; CHECK: test_rol:
+; CHECK: vspltisw
+; CHECK-NEXT: vrlw
+; CHECK-NEXT: blr
 }