[mips] Fix more incorrect uses of HasMips64 and isMips64()

Summary:
- Conditional moves acting on 64-bit GPR's should require MIPS-IV rather than MIPS64
- ISD::MUL, and ISD::MULH[US] should be lowered on all 64-bit ISA's

Patch by David Chisnall
His work was sponsored by: DARPA, AFRL

I've added additional testcases to cover as much of the codegen changes
affecting MIPS-IV as I can. Where I've been unable to find an existing
MIPS64 testcase that can be re-used for MIPS-IV (mainly tests covering
ISD::GlobalAddress and similar), I at least agree that MIPS-IV should
behave like MIPS64. Further testcases that are fixed by this patch will follow
in my next commit. The testcases from that commit that fail for MIPS-IV without
this patch are:
    LLVM :: CodeGen/Mips/2010-07-20-Switch.ll
    LLVM :: CodeGen/Mips/cmov.ll
    LLVM :: CodeGen/Mips/eh-dwarf-cfa.ll
    LLVM :: CodeGen/Mips/largeimmprinting.ll
    LLVM :: CodeGen/Mips/longbranch.ll
    LLVM :: CodeGen/Mips/mips64-f128.ll
    LLVM :: CodeGen/Mips/mips64directive.ll
    LLVM :: CodeGen/Mips/mips64ext.ll
    LLVM :: CodeGen/Mips/mips64fpldst.ll
    LLVM :: CodeGen/Mips/mips64intldst.ll
    LLVM :: CodeGen/Mips/mips64load-store-left-right.ll
    LLVM :: CodeGen/Mips/sint-fp-store_pattern.ll

Reviewers: dsanders

Reviewed By: dsanders

CC: matheusalmeida

Differential Revision: http://reviews.llvm.org/D3343

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206183 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/MipsCondMov.td

@@ -139,7 +139,7 @@ def MOVN_I_S : MMRel, CMov_I_F_FT<"movn.s", GPR32Opnd, FGR32Opnd, II_MOVN_S>,
 
 let isCodeGenOnly = 1 in
 def MOVN_I64_S : CMov_I_F_FT<"movn.s", GPR64Opnd, FGR32Opnd, II_MOVN_S>,
-                 CMov_I_F_FM<19, 16>, Requires<[HasMips64, HasStdEnc]>;
+                 CMov_I_F_FM<19, 16>, Requires<[IsGP64bit, HasStdEnc]>;
 
 let Predicates = [NotFP64bit, HasStdEnc] in {
   def MOVZ_I_D32 : MMRel, CMov_I_F_FT<"movz.d", GPR32Opnd, AFGR64Opnd,
@@ -166,14 +166,14 @@ def MOVT_I : MMRel, CMov_F_I_FT<"movt", GPR32Opnd, II_MOVT, MipsCMovFP_T>,
 
 let isCodeGenOnly = 1 in
 def MOVT_I64 : CMov_F_I_FT<"movt", GPR64Opnd, II_MOVT, MipsCMovFP_T>,
-               CMov_F_I_FM<1>, Requires<[HasMips64, HasStdEnc]>;
+               CMov_F_I_FM<1>, Requires<[IsGP64bit, HasStdEnc]>;
 
 def MOVF_I : MMRel, CMov_F_I_FT<"movf", GPR32Opnd, II_MOVF, MipsCMovFP_F>,
              CMov_F_I_FM<0>;
 
 let isCodeGenOnly = 1 in
 def MOVF_I64 : CMov_F_I_FT<"movf", GPR64Opnd, II_MOVF, MipsCMovFP_F>,
-               CMov_F_I_FM<0>, Requires<[HasMips64, HasStdEnc]>;
+               CMov_F_I_FM<0>, Requires<[IsGP64bit, HasStdEnc]>;
 
 def MOVT_S : MMRel, CMov_F_F_FT<"movt.s", FGR32Opnd, II_MOVT_S, MipsCMovFP_T>,
              CMov_F_F_FM<16, 1>;
@@ -198,7 +198,7 @@ let Predicates = [IsFP64bit, HasStdEnc], DecoderNamespace = "Mips64" in {
 defm : MovzPats0<GPR32, GPR32, MOVZ_I_I, SLT, SLTu, SLTi, SLTiu>;
 defm : MovzPats1<GPR32, GPR32, MOVZ_I_I, XOR>;
 defm : MovzPats2<GPR32, GPR32, MOVZ_I_I, XORi>;
-let Predicates = [HasMips64, HasStdEnc] in {
+let Predicates = [IsGP64bit, HasStdEnc] in {
   defm : MovzPats0<GPR32, GPR64, MOVZ_I_I64, SLT, SLTu, SLTi, SLTiu>;
   defm : MovzPats0<GPR64, GPR32, MOVZ_I_I, SLT64, SLTu64, SLTi64,
                    SLTiu64>;
@@ -213,7 +213,7 @@ let Predicates = [HasMips64, HasStdEnc] in {
 }
 
 defm : MovnPats<GPR32, GPR32, MOVN_I_I, XOR>;
-let Predicates = [HasMips64, HasStdEnc] in {
+let Predicates = [IsGP64bit, HasStdEnc] in {
   defm : MovnPats<GPR32, GPR64, MOVN_I_I64, XOR>;
   defm : MovnPats<GPR64, GPR32, MOVN_I64_I, XOR64>;
   defm : MovnPats<GPR64, GPR64, MOVN_I64_I64, XOR64>;
@@ -222,7 +222,7 @@ let Predicates = [HasMips64, HasStdEnc] in {
 defm : MovzPats0<GPR32, FGR32, MOVZ_I_S, SLT, SLTu, SLTi, SLTiu>;
 defm : MovzPats1<GPR32, FGR32, MOVZ_I_S, XOR>;
 defm : MovnPats<GPR32, FGR32, MOVN_I_S, XOR>;
-let Predicates = [HasMips64, HasStdEnc] in {
+let Predicates = [IsGP64bit, HasStdEnc] in {
   defm : MovzPats0<GPR64, FGR32, MOVZ_I_S, SLT64, SLTu64, SLTi64,
                    SLTiu64>;
   defm : MovzPats1<GPR64, FGR32, MOVZ_I64_S, XOR64>;

lib/Target/Mips/MipsISelLowering.cpp

@@ -245,7 +245,7 @@ MipsTargetLowering::MipsTargetLowering(MipsTargetMachine &TM)
   setOperationAction(ISD::FCOPYSIGN,          MVT::f64,   Custom);
   setOperationAction(ISD::FP_TO_SINT,         MVT::i32,   Custom);
 
-  if (hasMips64()) {
+  if (isGP64bit()) {
     setOperationAction(ISD::GlobalAddress,      MVT::i64,   Custom);
     setOperationAction(ISD::BlockAddress,       MVT::i64,   Custom);
     setOperationAction(ISD::GlobalTLSAddress,   MVT::i64,   Custom);
@@ -257,14 +257,14 @@ MipsTargetLowering::MipsTargetLowering(MipsTargetMachine &TM)
     setOperationAction(ISD::FP_TO_SINT,         MVT::i64,   Custom);
   }
 
-  if (!hasMips64()) {
+  if (!isGP64bit()) {
     setOperationAction(ISD::SHL_PARTS,          MVT::i32,   Custom);
     setOperationAction(ISD::SRA_PARTS,          MVT::i32,   Custom);
     setOperationAction(ISD::SRL_PARTS,          MVT::i32,   Custom);
   }
 
   setOperationAction(ISD::ADD,                MVT::i32,   Custom);
-  if (hasMips64())
+  if (isGP64bit())
     setOperationAction(ISD::ADD,                MVT::i64,   Custom);
 
   setOperationAction(ISD::SDIV, MVT::i32, Expand);
@@ -361,7 +361,7 @@ MipsTargetLowering::MipsTargetLowering(MipsTargetMachine &TM)
     setOperationAction(ISD::BSWAP, MVT::i64, Expand);
   }
 
-  if (hasMips64()) {
+  if (isGP64bit()) {
     setLoadExtAction(ISD::SEXTLOAD, MVT::i32, Custom);
     setLoadExtAction(ISD::ZEXTLOAD, MVT::i32, Custom);
     setLoadExtAction(ISD::EXTLOAD, MVT::i32, Custom);
@@ -377,7 +377,7 @@ MipsTargetLowering::MipsTargetLowering(MipsTargetMachine &TM)
   setTargetDAGCombine(ISD::OR);
   setTargetDAGCombine(ISD::ADD);
 
-  setMinFunctionAlignment(hasMips64() ? 3 : 2);
+  setMinFunctionAlignment(isGP64bit() ? 3 : 2);
 
   setStackPointerRegisterToSaveRestore(isN64() ? Mips::SP_64 : Mips::SP);
 

lib/Target/Mips/MipsInstrInfo.td

@@ -160,6 +160,10 @@ def HasMips32    :    Predicate<"Subtarget.hasMips32()">,
                       AssemblerPredicate<"FeatureMips32">;
 def HasMips32r2  :    Predicate<"Subtarget.hasMips32r2()">,
                       AssemblerPredicate<"FeatureMips32r2">;
+def IsGP64bit    :    Predicate<"Subtarget.isGP64bit()">,
+                      AssemblerPredicate<"FeatureGP64Bit">;
+def IsGP32bit    :    Predicate<"!Subtarget.isGP64bit()">,
+                      AssemblerPredicate<"!FeatureGP64Bit">;
 def HasMips64    :    Predicate<"Subtarget.hasMips64()">,
                       AssemblerPredicate<"FeatureMips64">;
 def IsGP32       :    Predicate<"!Subtarget.isGP64()">,

lib/Target/Mips/MipsSEISelLowering.cpp

@@ -119,10 +119,10 @@ MipsSETargetLowering::MipsSETargetLowering(MipsTargetMachine &TM)
 
   if (Subtarget->hasCnMips())
     setOperationAction(ISD::MUL,              MVT::i64, Legal);
-  else if (hasMips64())
+  else if (isGP64bit())
     setOperationAction(ISD::MUL,              MVT::i64, Custom);
 
-  if (hasMips64()) {
+  if (isGP64bit()) {
     setOperationAction(ISD::MULHS,            MVT::i64, Custom);
     setOperationAction(ISD::MULHU,            MVT::i64, Custom);
   }

test/CodeGen/Mips/cmov.ll

@@ -1,6 +1,7 @@
 ; RUN: llc -march=mips < %s | FileCheck %s -check-prefix=O32
 ; RUN: llc -march=mips -regalloc=basic < %s | FileCheck %s -check-prefix=O32
 ; RUN: llc -march=mips64el -mcpu=mips64 -mattr=n64 < %s | FileCheck %s -check-prefix=N64
+; RUN: llc -march=mips64el -mcpu=mips4 -mattr=n64 < %s | FileCheck %s -check-prefix=N64
 
 @i1 = global [3 x i32] [i32 1, i32 2, i32 3], align 4
 @i3 = common global i32* null, align 4

test/CodeGen/Mips/mips64instrs.ll

@@ -1,4 +1,5 @@
-; RUN: llc -march=mips64el -mcpu=mips64 -verify-machineinstrs < %s | FileCheck %s
+; RUN: llc -march=mips64el -mcpu=mips4 -verify-machineinstrs < %s | FileCheck -check-prefix=CHECK -check-prefix=MIPS4 %s
+; RUN: llc -march=mips64el -mcpu=mips64 -verify-machineinstrs < %s | FileCheck -check-prefix=CHECK -check-prefix=MIPS64 %s
 
 @gll0 = common global i64 0, align 8
 @gll1 = common global i64 0, align 8
@@ -135,14 +136,24 @@ declare i64 @llvm.ctlz.i64(i64, i1) nounwind readnone
 
 define i64 @f18(i64 %X) nounwind readnone {
 entry:
-; CHECK: dclz $2, $4
+; CHECK-LABEL: f18:
+
+; The MIPS4 version is too long to reasonably test. At least check we don't get dclz
+; MIPS4-NOT: dclz
+
+; MIPS64: dclz $2, $4
   %tmp1 = tail call i64 @llvm.ctlz.i64(i64 %X, i1 true)
   ret i64 %tmp1
 }
 
 define i64 @f19(i64 %X) nounwind readnone {
 entry:
-; CHECK: dclo $2, $4
+; CHECK-LABEL: f19:
+
+; The MIPS4 version is too long to reasonably test. At least check we don't get dclo
+; MIPS4-NOT: dclo
+
+; MIPS64: dclo $2, $4
   %neg = xor i64 %X, -1
   %tmp1 = tail call i64 @llvm.ctlz.i64(i64 %neg, i1 true)
   ret i64 %tmp1
@@ -150,6 +161,7 @@ entry:
 
 define i64 @f20(i64 %a, i64 %b) nounwind readnone {
 entry:
+; CHECK-LABEL: f20:
 ; CHECK: nor
   %or = or i64 %b, %a
   %neg = xor i64 %or, -1

test/CodeGen/Mips/mips64muldiv.ll

@@ -1,3 +1,4 @@
+; RUN: llc -march=mips64el -mcpu=mips4 < %s | FileCheck %s
 ; RUN: llc -march=mips64el -mcpu=mips64 < %s | FileCheck %s
 
 define i64 @m0(i64 %a0, i64 %a1) nounwind readnone {