From d597263b9442923bacc24f26a8510fb69f992864 Mon Sep 17 00:00:00 2001
From: Akira Hatanaka <ahatanaka@mips.com>
Date: Mon, 22 Apr 2013 19:58:23 +0000
Subject: [mips] In performDSPShiftCombine, check that all elements in the
 vector are shifted by the same amount and the shift amount is smaller than
 the element size.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180039 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Mips/MipsDSPInstrInfo.td    | 14 ++++-----
 lib/Target/Mips/MipsSEISelLowering.cpp |  8 +++--
 test/CodeGen/Mips/dsp-patterns.ll      | 56 ++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 10 deletions(-)

diff --git a/lib/Target/Mips/MipsDSPInstrInfo.td b/lib/Target/Mips/MipsDSPInstrInfo.td
index 6790a27..23c6a05 100644
--- a/lib/Target/Mips/MipsDSPInstrInfo.td
+++ b/lib/Target/Mips/MipsDSPInstrInfo.td
@@ -1288,18 +1288,18 @@ def : DSPBinPat<ADDWC, i32, adde>;
 
 // Shift immediate patterns.
 class DSPShiftPat<Instruction Inst, ValueType ValTy, SDPatternOperator Node,
-                  ImmLeaf Imm, Predicate Pred = HasDSP> :
+                  SDPatternOperator Imm, Predicate Pred = HasDSP> :
   DSPPat<(Node ValTy:$a, Imm:$shamt), (Inst ValTy:$a, Imm:$shamt), Pred>;
 
-def : DSPShiftPat<SHLL_PH, v2i16, MipsSHLL_DSP, immZExt4>;
-def : DSPShiftPat<SHRA_PH, v2i16, MipsSHRA_DSP, immZExt4>;
-def : DSPShiftPat<SHRL_PH, v2i16, MipsSHRL_DSP, immZExt4, HasDSPR2>;
+def : DSPShiftPat<SHLL_PH, v2i16, MipsSHLL_DSP, imm>;
+def : DSPShiftPat<SHRA_PH, v2i16, MipsSHRA_DSP, imm>;
+def : DSPShiftPat<SHRL_PH, v2i16, MipsSHRL_DSP, imm, HasDSPR2>;
 def : DSPShiftPat<SHLL_PH, v2i16, int_mips_shll_ph, immZExt4>;
 def : DSPShiftPat<SHRA_PH, v2i16, int_mips_shra_ph, immZExt4>;
 def : DSPShiftPat<SHRL_PH, v2i16, int_mips_shrl_ph, immZExt4, HasDSPR2>;
-def : DSPShiftPat<SHLL_QB, v4i8, MipsSHLL_DSP, immZExt3>;
-def : DSPShiftPat<SHRA_QB, v4i8, MipsSHRA_DSP, immZExt3, HasDSPR2>;
-def : DSPShiftPat<SHRL_QB, v4i8, MipsSHRL_DSP, immZExt3>;
+def : DSPShiftPat<SHLL_QB, v4i8, MipsSHLL_DSP, imm>;
+def : DSPShiftPat<SHRA_QB, v4i8, MipsSHRA_DSP, imm, HasDSPR2>;
+def : DSPShiftPat<SHRL_QB, v4i8, MipsSHRL_DSP, imm>;
 def : DSPShiftPat<SHLL_QB, v4i8, int_mips_shll_qb, immZExt3>;
 def : DSPShiftPat<SHRA_QB, v4i8, int_mips_shra_qb, immZExt3, HasDSPR2>;
 def : DSPShiftPat<SHRL_QB, v4i8, int_mips_shrl_qb, immZExt3>;
diff --git a/lib/Target/Mips/MipsSEISelLowering.cpp b/lib/Target/Mips/MipsSEISelLowering.cpp
index ca911f0..23d2578 100644
--- a/lib/Target/Mips/MipsSEISelLowering.cpp
+++ b/lib/Target/Mips/MipsSEISelLowering.cpp
@@ -327,9 +327,11 @@ static SDValue performDSPShiftCombine(unsigned Opc, SDNode *N, EVT Ty,
   unsigned EltSize = Ty.getVectorElementType().getSizeInBits();
   BuildVectorSDNode *BV = dyn_cast<BuildVectorSDNode>(N->getOperand(1));
 
-  if (!BV || !BV->isConstantSplat(SplatValue, SplatUndef, SplatBitSize,
-                                  HasAnyUndefs, EltSize,
-                                  !Subtarget->isLittle()))
+  if (!BV ||
+      !BV->isConstantSplat(SplatValue, SplatUndef, SplatBitSize, HasAnyUndefs, EltSize,
+                           !Subtarget->isLittle()) ||
+      (SplatBitSize != EltSize) ||
+      !isUIntN(Log2_32(EltSize), SplatValue.getZExtValue()))
     return SDValue();
 
   return DAG.getNode(Opc, N->getDebugLoc(), Ty, N->getOperand(0),
diff --git a/test/CodeGen/Mips/dsp-patterns.ll b/test/CodeGen/Mips/dsp-patterns.ll
index c2aeab5..eeb7140 100644
--- a/test/CodeGen/Mips/dsp-patterns.ll
+++ b/test/CodeGen/Mips/dsp-patterns.ll
@@ -203,3 +203,59 @@ entry:
   %.fca.0.insert = insertvalue { i32 } undef, i32 %1, 0
   ret { i32 } %.fca.0.insert
 }
+
+; Check that shift node is expanded if splat element size is not 16-bit.
+;
+; R1: test_vector_splat_imm_v2q15:
+; R1-NOT: shll.ph
+
+define { i32 } @test_vector_splat_imm_v2q15(i32 %a.coerce) {
+entry:
+  %0 = bitcast i32 %a.coerce to <2 x i16>
+  %shl = shl <2 x i16> %0, <i16 0, i16 2>
+  %1 = bitcast <2 x i16> %shl to i32
+  %.fca.0.insert = insertvalue { i32 } undef, i32 %1, 0
+  ret { i32 } %.fca.0.insert
+}
+
+; Check that shift node is expanded if splat element size is not 8-bit.
+;
+; R1: test_vector_splat_imm_v4i8:
+; R1-NOT: shll.qb
+
+define { i32 } @test_vector_splat_imm_v4i8(i32 %a.coerce) {
+entry:
+  %0 = bitcast i32 %a.coerce to <4 x i8>
+  %shl = shl <4 x i8> %0, <i8 0, i8 2, i8 0, i8 2>
+  %1 = bitcast <4 x i8> %shl to i32
+  %.fca.0.insert = insertvalue { i32 } undef, i32 %1, 0
+  ret { i32 } %.fca.0.insert
+}
+
+; Check that shift node is expanded if shift amount doesn't fit in 4-bit sa field.
+;
+; R1: test_shift_amount_v2q15:
+; R1-NOT: shll.ph
+
+define { i32 } @test_shift_amount_v2q15(i32 %a.coerce) {
+entry:
+  %0 = bitcast i32 %a.coerce to <2 x i16>
+  %shl = shl <2 x i16> %0, <i16 16, i16 16>
+  %1 = bitcast <2 x i16> %shl to i32
+  %.fca.0.insert = insertvalue { i32 } undef, i32 %1, 0
+  ret { i32 } %.fca.0.insert
+}
+
+; Check that shift node is expanded if shift amount doesn't fit in 3-bit sa field.
+;
+; R1: test_shift_amount_v4i8:
+; R1-NOT: shll.qb
+
+define { i32 } @test_shift_amount_v4i8(i32 %a.coerce) {
+entry:
+  %0 = bitcast i32 %a.coerce to <4 x i8>
+  %shl = shl <4 x i8> %0, <i8 8, i8 8, i8 8, i8 8>
+  %1 = bitcast <4 x i8> %shl to i32
+  %.fca.0.insert = insertvalue { i32 } undef, i32 %1, 0
+  ret { i32 } %.fca.0.insert
+}
-- 
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