[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
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 @@
// 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 @@
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 @@
%.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
+}