Revert 23028 - "MIPS: Add support for arch. revision 6 to mips32 port."

src/mips/macro-assembler-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS
 
@@ skipping 623 matching lines @@
       DCHECK(!rs.is(at));
       li(at, rt);
       subu(rd, rs, at);
     }
   }
 }
 
 
 void MacroAssembler::Mul(Register rd, Register rs, const Operand& rt) {
   if (rt.is_reg()) {
-    if (IsMipsArchVariant(kLoongson)) {
+    if (kArchVariant == kLoongson) {
       mult(rs, rt.rm());
       mflo(rd);
     } else {
       mul(rd, rs, rt.rm());
     }
   } else {
     // li handles the relocation.
     DCHECK(!rs.is(at));
     li(at, rt);
-    if (IsMipsArchVariant(kLoongson)) {
+    if (kArchVariant == kLoongson) {
       mult(rs, at);
       mflo(rd);
     } else {
       mul(rd, rs, at);
     }
   }
 }
 
 
-void MacroAssembler::Mul(Register rd_hi, Register rd_lo,
-    Register rs, const Operand& rt) {
-  if (rt.is_reg()) {
-    if (!IsMipsArchVariant(kMips32r6)) {
-      mult(rs, rt.rm());
-      mflo(rd_lo);
-      mfhi(rd_hi);
-    } else {
-      if (rd_lo.is(rs)) {
-        DCHECK(!rd_hi.is(rs));
-        DCHECK(!rd_hi.is(rt.rm()) && !rd_lo.is(rt.rm()));
-        muh(rd_hi, rs, rt.rm());
-        mul(rd_lo, rs, rt.rm());
-      } else {
-        DCHECK(!rd_hi.is(rt.rm()) && !rd_lo.is(rt.rm()));
-        mul(rd_lo, rs, rt.rm());
-        muh(rd_hi, rs, rt.rm());
-      }
-    }
-  } else {
-    // li handles the relocation.
-    DCHECK(!rs.is(at));
-    li(at, rt);
-    if (!IsMipsArchVariant(kMips32r6)) {
-      mult(rs, at);
-      mflo(rd_lo);
-      mfhi(rd_hi);
-    } else {
-      if (rd_lo.is(rs)) {
-        DCHECK(!rd_hi.is(rs));
-        DCHECK(!rd_hi.is(at) && !rd_lo.is(at));
-        muh(rd_hi, rs, at);
-        mul(rd_lo, rs, at);
-      } else {
-        DCHECK(!rd_hi.is(at) && !rd_lo.is(at));
-        mul(rd_lo, rs, at);
-        muh(rd_hi, rs, at);
-      }
-    }
-  }
-}
-
-
-void MacroAssembler::Mulh(Register rd, Register rs, const Operand& rt) {
-  if (rt.is_reg()) {
-    if (!IsMipsArchVariant(kMips32r6)) {
-      mult(rs, rt.rm());
-      mfhi(rd);
-    } else {
-      muh(rd, rs, rt.rm());
-    }
-  } else {
-    // li handles the relocation.
-    DCHECK(!rs.is(at));
-    li(at, rt);
-    if (!IsMipsArchVariant(kMips32r6)) {
-      mult(rs, at);
-      mfhi(rd);
-    } else {
-      muh(rd, rs, at);
-    }
-  }
-}
-
-
 void MacroAssembler::Mult(Register rs, const Operand& rt) {
   if (rt.is_reg()) {
     mult(rs, rt.rm());
   } else {
     // li handles the relocation.
     DCHECK(!rs.is(at));
     li(at, rt);
     mult(rs, at);
   }
 }
@@ skipping 16 matching lines @@
     div(rs, rt.rm());
   } else {
     // li handles the relocation.
     DCHECK(!rs.is(at));
     li(at, rt);
     div(rs, at);
   }
 }
 
 
-void MacroAssembler::Div(Register rem, Register res,
-    Register rs, const Operand& rt) {
-  if (rt.is_reg()) {
-    if (!IsMipsArchVariant(kMips32r6)) {
-      div(rs, rt.rm());
-      mflo(res);
-      mfhi(rem);
-    } else {
-      div(res, rs, rt.rm());
-      mod(rem, rs, rt.rm());
-    }
-  } else {
-    // li handles the relocation.
-    DCHECK(!rs.is(at));
-    li(at, rt);
-    if (!IsMipsArchVariant(kMips32r6)) {
-      div(rs, at);
-      mflo(res);
-      mfhi(rem);
-    } else {
-      div(res, rs, at);
-      mod(rem, rs, at);
-    }
-  }
-}
-
-
-void MacroAssembler::Mod(Register rd, Register rs, const Operand& rt) {
-  if (rt.is_reg()) {
-    if (!IsMipsArchVariant(kMips32r6)) {
-      div(rs, rt.rm());
-      mfhi(rd);
-    } else {
-      mod(rd, rs, rt.rm());
-    }
-  } else {
-    // li handles the relocation.
-    DCHECK(!rs.is(at));
-    li(at, rt);
-    if (!IsMipsArchVariant(kMips32r6)) {
-      div(rs, at);
-      mfhi(rd);
-    } else {
-      mod(rd, rs, at);
-    }
-  }
-}
-
-
 void MacroAssembler::Divu(Register rs, const Operand& rt) {
   if (rt.is_reg()) {
     divu(rs, rt.rm());
   } else {
     // li handles the relocation.
     DCHECK(!rs.is(at));
     li(at, rt);
     divu(rs, at);
   }
 }
@@ skipping 94 matching lines @@
       // li handles the relocation.
       DCHECK(!rs.is(at));
       li(at, rt);
       sltu(rd, rs, at);
     }
   }
 }
 
 
 void MacroAssembler::Ror(Register rd, Register rs, const Operand& rt) {
-  if (IsMipsArchVariant(kMips32r2) || IsMipsArchVariant(kMips32r6)) {
+  if (kArchVariant == kMips32r2) {
     if (rt.is_reg()) {
       rotrv(rd, rs, rt.rm());
     } else {
       rotr(rd, rs, rt.imm32_);
     }
   } else {
     if (rt.is_reg()) {
       subu(at, zero_reg, rt.rm());
       sllv(at, rs, at);
       srlv(rd, rs, rt.rm());
       or_(rd, rd, at);
     } else {
       if (rt.imm32_ == 0) {
         srl(rd, rs, 0);
       } else {
         srl(at, rs, rt.imm32_);
         sll(rd, rs, (0x20 - rt.imm32_) & 0x1f);
         or_(rd, rd, at);
       }
     }
   }
 }
 
 
 void MacroAssembler::Pref(int32_t hint, const MemOperand& rs) {
-  if (IsMipsArchVariant(kLoongson)) {
+  if (kArchVariant == kLoongson) {
     lw(zero_reg, rs);
   } else {
     pref(hint, rs);
   }
 }
 
 
 // ------------Pseudo-instructions-------------
 
 void MacroAssembler::Ulw(Register rd, const MemOperand& rs) {
@@ skipping 175 matching lines @@
 }
 
 
 void MacroAssembler::Ext(Register rt,
                          Register rs,
                          uint16_t pos,
                          uint16_t size) {
   DCHECK(pos < 32);
   DCHECK(pos + size < 33);
 
-  if (IsMipsArchVariant(kMips32r2) || IsMipsArchVariant(kMips32r6)) {
+  if (kArchVariant == kMips32r2) {
     ext_(rt, rs, pos, size);
   } else {
     // Move rs to rt and shift it left then right to get the
     // desired bitfield on the right side and zeroes on the left.
     int shift_left = 32 - (pos + size);
     sll(rt, rs, shift_left);  // Acts as a move if shift_left == 0.
 
     int shift_right = 32 - size;
     if (shift_right > 0) {
       srl(rt, rt, shift_right);
     }
   }
 }
 
 
 void MacroAssembler::Ins(Register rt,
                          Register rs,
                          uint16_t pos,
                          uint16_t size) {
   DCHECK(pos < 32);
   DCHECK(pos + size <= 32);
   DCHECK(size != 0);
 
-  if (IsMipsArchVariant(kMips32r2) || IsMipsArchVariant(kMips32r6)) {
+  if (kArchVariant == kMips32r2) {
     ins_(rt, rs, pos, size);
   } else {
     DCHECK(!rt.is(t8) && !rs.is(t8));
     Subu(at, zero_reg, Operand(1));
     srl(at, at, 32 - size);
     and_(t8, rs, at);
     sll(t8, t8, pos);
     sll(at, at, pos);
     nor(at, at, zero_reg);
     and_(at, rt, at);
@@ skipping 33 matching lines @@
   cvt_d_w(fd, fd);
 
   Label conversion_done;
 
   // If rs's MSB was 0, it's done.
   // Otherwise we need to add that to the FP register.
   Branch(&conversion_done, eq, t9, Operand(zero_reg));
 
   // Load 2^31 into f20 as its float representation.
   li(at, 0x41E00000);
+  mtc1(at, FPURegister::from_code(scratch.code() + 1));
   mtc1(zero_reg, scratch);
-  Mthc1(at, scratch);
   // Add it to fd.
   add_d(fd, fd, scratch);
 
   bind(&conversion_done);
 }
 
 
 void MacroAssembler::Trunc_uw_d(FPURegister fd,
                                 FPURegister fs,
                                 FPURegister scratch) {
   Trunc_uw_d(fs, t8, scratch);
   mtc1(t8, fd);
 }
 
 
 void MacroAssembler::Trunc_w_d(FPURegister fd, FPURegister fs) {
-  if (IsMipsArchVariant(kLoongson) && fd.is(fs)) {
-    Mfhc1(t8, fs);
+  if (kArchVariant == kLoongson && fd.is(fs)) {
+    mfc1(t8, FPURegister::from_code(fs.code() + 1));
     trunc_w_d(fd, fs);
-    Mthc1(t8, fs);
+    mtc1(t8, FPURegister::from_code(fs.code() + 1));
   } else {
     trunc_w_d(fd, fs);
   }
 }
 
 
 void MacroAssembler::Round_w_d(FPURegister fd, FPURegister fs) {
-  if (IsMipsArchVariant(kLoongson) && fd.is(fs)) {
-    Mfhc1(t8, fs);
+  if (kArchVariant == kLoongson && fd.is(fs)) {
+    mfc1(t8, FPURegister::from_code(fs.code() + 1));
     round_w_d(fd, fs);
-    Mthc1(t8, fs);
+    mtc1(t8, FPURegister::from_code(fs.code() + 1));
   } else {
     round_w_d(fd, fs);
   }
 }
 
 
 void MacroAssembler::Floor_w_d(FPURegister fd, FPURegister fs) {
-  if (IsMipsArchVariant(kLoongson) && fd.is(fs)) {
-    Mfhc1(t8, fs);
+  if (kArchVariant == kLoongson && fd.is(fs)) {
+    mfc1(t8, FPURegister::from_code(fs.code() + 1));
     floor_w_d(fd, fs);
-    Mthc1(t8, fs);
+    mtc1(t8, FPURegister::from_code(fs.code() + 1));
   } else {
     floor_w_d(fd, fs);
   }
 }
 
 
 void MacroAssembler::Ceil_w_d(FPURegister fd, FPURegister fs) {
-  if (IsMipsArchVariant(kLoongson) && fd.is(fs)) {
-    Mfhc1(t8, fs);
+  if (kArchVariant == kLoongson && fd.is(fs)) {
+    mfc1(t8, FPURegister::from_code(fs.code() + 1));
     ceil_w_d(fd, fs);
-    Mthc1(t8, fs);
+    mtc1(t8, FPURegister::from_code(fs.code() + 1));
   } else {
     ceil_w_d(fd, fs);
   }
 }
 
 
 void MacroAssembler::Trunc_uw_d(FPURegister fd,
                                 Register rs,
                                 FPURegister scratch) {
   DCHECK(!fd.is(scratch));
   DCHECK(!rs.is(at));
 
   // Load 2^31 into scratch as its float representation.
   li(at, 0x41E00000);
+  mtc1(at, FPURegister::from_code(scratch.code() + 1));
   mtc1(zero_reg, scratch);
-  Mthc1(at, scratch);
   // Test if scratch > fd.
   // If fd < 2^31 we can convert it normally.
   Label simple_convert;
   BranchF(&simple_convert, NULL, lt, fd, scratch);
 
   // First we subtract 2^31 from fd, then trunc it to rs
   // and add 2^31 to rs.
   sub_d(scratch, fd, scratch);
   trunc_w_d(scratch, scratch);
   mfc1(rs, scratch);
   Or(rs, rs, 1 << 31);
 
   Label done;
   Branch(&done);
   // Simple conversion.
   bind(&simple_convert);
   trunc_w_d(scratch, fd);
   mfc1(rs, scratch);
 
   bind(&done);
 }
 
 
-void MacroAssembler::Mthc1(Register rt, FPURegister fs) {
-  if (IsFp64Mode()) {
-    mthc1(rt, fs);
-  } else {
-    mtc1(rt, fs.high());
-  }
-}
-
-
-void MacroAssembler::Mfhc1(Register rt, FPURegister fs) {
-  if (IsFp64Mode()) {
-    mfhc1(rt, fs);
-  } else {
-    mfc1(rt, fs.high());
-  }
-}
-
-
 void MacroAssembler::BranchF(Label* target,
                              Label* nan,
                              Condition cc,
                              FPURegister cmp1,
                              FPURegister cmp2,
                              BranchDelaySlot bd) {
   BlockTrampolinePoolScope block_trampoline_pool(this);
   if (cc == al) {
     Branch(bd, target);
     return;
   }
 
   DCHECK(nan || target);
   // Check for unordered (NaN) cases.
   if (nan) {
-    if (!IsMipsArchVariant(kMips32r6)) {
-      c(UN, D, cmp1, cmp2);
-      bc1t(nan);
-    } else {
-      // Use kDoubleCompareReg for comparison result. It has to be unavailable
-      // to lithium register allocator.
-      DCHECK(!cmp1.is(kDoubleCompareReg) && !cmp2.is(kDoubleCompareReg));
-      cmp(UN, L, kDoubleCompareReg, cmp1, cmp2);
-      bc1nez(nan, kDoubleCompareReg);
+    c(UN, D, cmp1, cmp2);
+    bc1t(nan);
+  }
+
+  if (target) {
+    // Here NaN cases were either handled by this function or are assumed to
+    // have been handled by the caller.
+    // Unsigned conditions are treated as their signed counterpart.
+    switch (cc) {
+      case lt:
+        c(OLT, D, cmp1, cmp2);
+        bc1t(target);
+        break;
+      case gt:
+        c(ULE, D, cmp1, cmp2);
+        bc1f(target);
+        break;
+      case ge:
+        c(ULT, D, cmp1, cmp2);
+        bc1f(target);
+        break;
+      case le:
+        c(OLE, D, cmp1, cmp2);
+        bc1t(target);
+        break;
+      case eq:
+        c(EQ, D, cmp1, cmp2);
+        bc1t(target);
+        break;
+      case ueq:
+        c(UEQ, D, cmp1, cmp2);
+        bc1t(target);
+        break;
+      case ne:
+        c(EQ, D, cmp1, cmp2);
+        bc1f(target);
+        break;
+      case nue:
+        c(UEQ, D, cmp1, cmp2);
+        bc1f(target);
+        break;
+      default:
+        CHECK(0);
     }
   }
 
-  if (!IsMipsArchVariant(kMips32r6)) {
-    if (target) {
-      // Here NaN cases were either handled by this function or are assumed to
-      // have been handled by the caller.
-      switch (cc) {
-        case lt:
-          c(OLT, D, cmp1, cmp2);
-          bc1t(target);
-          break;
-        case gt:
-          c(ULE, D, cmp1, cmp2);
-          bc1f(target);
-          break;
-        case ge:
-          c(ULT, D, cmp1, cmp2);
-          bc1f(target);
-          break;
-        case le:
-          c(OLE, D, cmp1, cmp2);
-          bc1t(target);
-          break;
-        case eq:
-          c(EQ, D, cmp1, cmp2);
-          bc1t(target);
-          break;
-        case ueq:
-          c(UEQ, D, cmp1, cmp2);
-          bc1t(target);
-          break;
-        case ne:
-          c(EQ, D, cmp1, cmp2);
-          bc1f(target);
-          break;
-        case nue:
-          c(UEQ, D, cmp1, cmp2);
-          bc1f(target);
-          break;
-        default:
-          CHECK(0);
-      }
-    }
-  } else {
-    if (target) {
-      // Here NaN cases were either handled by this function or are assumed to
-      // have been handled by the caller.
-      // Unsigned conditions are treated as their signed counterpart.
-      // Use kDoubleCompareReg for comparison result, it is
-      // valid in fp64 (FR = 1) mode which is implied for mips32r6.
-      DCHECK(!cmp1.is(kDoubleCompareReg) && !cmp2.is(kDoubleCompareReg));
-      switch (cc) {
-        case lt:
-          cmp(OLT, L, kDoubleCompareReg, cmp1, cmp2);
-          bc1nez(target, kDoubleCompareReg);
-          break;
-        case gt:
-          cmp(ULE, L, kDoubleCompareReg, cmp1, cmp2);
-          bc1eqz(target, kDoubleCompareReg);
-          break;
-        case ge:
-          cmp(ULT, L, kDoubleCompareReg, cmp1, cmp2);
-          bc1eqz(target, kDoubleCompareReg);
-          break;
-        case le:
-          cmp(OLE, L, kDoubleCompareReg, cmp1, cmp2);
-          bc1nez(target, kDoubleCompareReg);
-          break;
-        case eq:
-          cmp(EQ, L, kDoubleCompareReg, cmp1, cmp2);
-          bc1nez(target, kDoubleCompareReg);
-          break;
-        case ueq:
-          cmp(UEQ, L, kDoubleCompareReg, cmp1, cmp2);
-          bc1nez(target, kDoubleCompareReg);
-          break;
-        case ne:
-          cmp(EQ, L, kDoubleCompareReg, cmp1, cmp2);
-          bc1eqz(target, kDoubleCompareReg);
-          break;
-        case nue:
-          cmp(UEQ, L, kDoubleCompareReg, cmp1, cmp2);
-          bc1eqz(target, kDoubleCompareReg);
-          break;
-        default:
-          CHECK(0);
-      }
-    }
-  }
-
   if (bd == PROTECT) {
     nop();
   }
 }
 
 
 void MacroAssembler::Move(FPURegister dst, double imm) {
   static const DoubleRepresentation minus_zero(-0.0);
   static const DoubleRepresentation zero(0.0);
   DoubleRepresentation value_rep(imm);
@@ skipping 11 matching lines @@
     if (lo != 0) {
       li(at, Operand(lo));
       mtc1(at, dst);
     } else {
       mtc1(zero_reg, dst);
     }
     // Move the high part of the double into the higher of the corresponding FPU
     // register of FPU register pair.
     if (hi != 0) {
       li(at, Operand(hi));
-      Mthc1(at, dst);
+      mtc1(at, dst.high());
     } else {
-      Mthc1(zero_reg, dst);
+      mtc1(zero_reg, dst.high());
     }
   }
 }
 
 
 void MacroAssembler::Movz(Register rd, Register rs, Register rt) {
-  if (IsMipsArchVariant(kLoongson) || IsMipsArchVariant(kMips32r6)) {
+  if (kArchVariant == kLoongson) {
     Label done;
     Branch(&done, ne, rt, Operand(zero_reg));
     mov(rd, rs);
     bind(&done);
   } else {
     movz(rd, rs, rt);
   }
 }
 
 
 void MacroAssembler::Movn(Register rd, Register rs, Register rt) {
-  if (IsMipsArchVariant(kLoongson) || IsMipsArchVariant(kMips32r6)) {
+  if (kArchVariant == kLoongson) {
     Label done;
     Branch(&done, eq, rt, Operand(zero_reg));
     mov(rd, rs);
     bind(&done);
   } else {
     movn(rd, rs, rt);
   }
 }
 
 
 void MacroAssembler::Movt(Register rd, Register rs, uint16_t cc) {
-  if (IsMipsArchVariant(kLoongson)) {
+  if (kArchVariant == kLoongson) {
     // Tests an FP condition code and then conditionally move rs to rd.
     // We do not currently use any FPU cc bit other than bit 0.
     DCHECK(cc == 0);
     DCHECK(!(rs.is(t8) || rd.is(t8)));
     Label done;
     Register scratch = t8;
     // For testing purposes we need to fetch content of the FCSR register and
     // than test its cc (floating point condition code) bit (for cc = 0, it is
     // 24. bit of the FCSR).
     cfc1(scratch, FCSR);
     // For the MIPS I, II and III architectures, the contents of scratch is
     // UNPREDICTABLE for the instruction immediately following CFC1.
     nop();
     srl(scratch, scratch, 16);
     andi(scratch, scratch, 0x0080);
     Branch(&done, eq, scratch, Operand(zero_reg));
     mov(rd, rs);
     bind(&done);
   } else {
     movt(rd, rs, cc);
   }
 }
 
 
 void MacroAssembler::Movf(Register rd, Register rs, uint16_t cc) {
-  if (IsMipsArchVariant(kLoongson)) {
+  if (kArchVariant == kLoongson) {
     // Tests an FP condition code and then conditionally move rs to rd.
     // We do not currently use any FPU cc bit other than bit 0.
     DCHECK(cc == 0);
     DCHECK(!(rs.is(t8) || rd.is(t8)));
     Label done;
     Register scratch = t8;
     // For testing purposes we need to fetch content of the FCSR register and
     // than test its cc (floating point condition code) bit (for cc = 0, it is
     // 24. bit of the FCSR).
     cfc1(scratch, FCSR);
     // For the MIPS I, II and III architectures, the contents of scratch is
     // UNPREDICTABLE for the instruction immediately following CFC1.
     nop();
     srl(scratch, scratch, 16);
     andi(scratch, scratch, 0x0080);
     Branch(&done, ne, scratch, Operand(zero_reg));
     mov(rd, rs);
     bind(&done);
   } else {
     movf(rd, rs, cc);
   }
 }
 
 
 void MacroAssembler::Clz(Register rd, Register rs) {
-  if (IsMipsArchVariant(kLoongson)) {
+  if (kArchVariant == kLoongson) {
     DCHECK(!(rd.is(t8) || rd.is(t9)) && !(rs.is(t8) || rs.is(t9)));
     Register mask = t8;
     Register scratch = t9;
     Label loop, end;
     mov(at, rs);
     mov(rd, zero_reg);
     lui(mask, 0x8000);
     bind(&loop);
     and_(scratch, at, mask);
     Branch(&end, ne, scratch, Operand(zero_reg));
@@ skipping 841 matching lines @@
   Register r2 = no_reg;
   Register scratch = at;
 
   if (rt.is_reg()) {
     r2 = rt.rm_;
   } else if (cond != cc_always) {
     r2 = scratch;
     li(r2, rt);
   }
 
-  if (!IsMipsArchVariant(kMips32r6)) {
+  {
     BlockTrampolinePoolScope block_trampoline_pool(this);
     switch (cond) {
       case cc_always:
         bal(offset);
         break;
       case eq:
         bne(rs, r2, 2);
         nop();
         bal(offset);
         break;
@@ skipping 43 matching lines @@
         break;
       case Uless_equal:
         sltu(scratch, r2, rs);
         addiu(scratch, scratch, -1);
         bltzal(scratch, offset);
         break;
 
       default:
         UNREACHABLE();
     }
-  } else {
-    BlockTrampolinePoolScope block_trampoline_pool(this);
-    switch (cond) {
-      case cc_always:
-        bal(offset);
-        break;
-      case eq:
-        bne(rs, r2, 2);
-        nop();
-        bal(offset);
-        break;
-      case ne:
-        beq(rs, r2, 2);
-        nop();
-        bal(offset);
-        break;
-
-      // Signed comparison.
-      case greater:
-        // rs > rt
-        slt(scratch, r2, rs);
-        beq(scratch, zero_reg, 2);
-        nop();
-        bal(offset);
-        break;
-      case greater_equal:
-        // rs >= rt
-        slt(scratch, rs, r2);
-        bne(scratch, zero_reg, 2);
-        nop();
-        bal(offset);
-        break;
-      case less:
-        // rs < r2
-        slt(scratch, rs, r2);
-        bne(scratch, zero_reg, 2);
-        nop();
-        bal(offset);
-        break;
-      case less_equal:
-        // rs <= r2
-        slt(scratch, r2, rs);
-        bne(scratch, zero_reg, 2);
-        nop();
-        bal(offset);
-        break;
-
-
-      // Unsigned comparison.
-      case Ugreater:
-        // rs > rt
-        sltu(scratch, r2, rs);
-        beq(scratch, zero_reg, 2);
-        nop();
-        bal(offset);
-        break;
-      case Ugreater_equal:
-        // rs >= rt
-        sltu(scratch, rs, r2);
-        bne(scratch, zero_reg, 2);
-        nop();
-        bal(offset);
-        break;
-      case Uless:
-        // rs < r2
-        sltu(scratch, rs, r2);
-        bne(scratch, zero_reg, 2);
-        nop();
-        bal(offset);
-        break;
-      case Uless_equal:
-        // rs <= r2
-        sltu(scratch, r2, rs);
-        bne(scratch, zero_reg, 2);
-        nop();
-        bal(offset);
-        break;
-      default:
-        UNREACHABLE();
-    }
   }
-
   // Emit a nop in the branch delay slot if required.
   if (bdslot == PROTECT)
     nop();
 }
 
 
 void MacroAssembler::BranchAndLinkShort(Label* L, BranchDelaySlot bdslot) {
   bal(shifted_branch_offset(L, false));
 
   // Emit a nop in the branch delay slot if required.
@@ skipping 10 matching lines @@
   int32_t offset = 0;
   Register r2 = no_reg;
   Register scratch = at;
   if (rt.is_reg()) {
     r2 = rt.rm_;
   } else if (cond != cc_always) {
     r2 = scratch;
     li(r2, rt);
   }
 
-  if (!IsMipsArchVariant(kMips32r6)) {
+  {
     BlockTrampolinePoolScope block_trampoline_pool(this);
     switch (cond) {
       case cc_always:
         offset = shifted_branch_offset(L, false);
         bal(offset);
         break;
       case eq:
         bne(rs, r2, 2);
         nop();
         offset = shifted_branch_offset(L, false);
@@ skipping 54 matching lines @@
       case Uless_equal:
         sltu(scratch, r2, rs);
         addiu(scratch, scratch, -1);
         offset = shifted_branch_offset(L, false);
         bltzal(scratch, offset);
         break;
 
       default:
         UNREACHABLE();
     }
-  } else {
-    BlockTrampolinePoolScope block_trampoline_pool(this);
-    switch (cond) {
-      case cc_always:
-        offset = shifted_branch_offset(L, false);
-        bal(offset);
-        break;
-      case eq:
-        bne(rs, r2, 2);
-        nop();
-        offset = shifted_branch_offset(L, false);
-        bal(offset);
-        break;
-      case ne:
-        beq(rs, r2, 2);
-        nop();
-        offset = shifted_branch_offset(L, false);
-        bal(offset);
-        break;
-
-      // Signed comparison.
-      case greater:
-        // rs > rt
-        slt(scratch, r2, rs);
-        beq(scratch, zero_reg, 2);
-        nop();
-        offset = shifted_branch_offset(L, false);
-        bal(offset);
-        break;
-      case greater_equal:
-        // rs >= rt
-        slt(scratch, rs, r2);
-        bne(scratch, zero_reg, 2);
-        nop();
-        offset = shifted_branch_offset(L, false);
-        bal(offset);
-        break;
-      case less:
-        // rs < r2
-        slt(scratch, rs, r2);
-        bne(scratch, zero_reg, 2);
-        nop();
-        offset = shifted_branch_offset(L, false);
-        bal(offset);
-        break;
-      case less_equal:
-        // rs <= r2
-        slt(scratch, r2, rs);
-        bne(scratch, zero_reg, 2);
-        nop();
-        offset = shifted_branch_offset(L, false);
-        bal(offset);
-        break;
-
-
-      // Unsigned comparison.
-      case Ugreater:
-        // rs > rt
-        sltu(scratch, r2, rs);
-        beq(scratch, zero_reg, 2);
-        nop();
-        offset = shifted_branch_offset(L, false);
-        bal(offset);
-        break;
-      case Ugreater_equal:
-        // rs >= rt
-        sltu(scratch, rs, r2);
-        bne(scratch, zero_reg, 2);
-        nop();
-        offset = shifted_branch_offset(L, false);
-        bal(offset);
-        break;
-      case Uless:
-        // rs < r2
-        sltu(scratch, rs, r2);
-        bne(scratch, zero_reg, 2);
-        nop();
-        offset = shifted_branch_offset(L, false);
-        bal(offset);
-        break;
-      case Uless_equal:
-        // rs <= r2
-        sltu(scratch, r2, rs);
-        bne(scratch, zero_reg, 2);
-        nop();
-        offset = shifted_branch_offset(L, false);
-        bal(offset);
-        break;
-
-      default:
-        UNREACHABLE();
-    }
   }
-
   // Check that offset could actually hold on an int16_t.
   DCHECK(is_int16(offset));
 
   // Emit a nop in the branch delay slot if required.
   if (bdslot == PROTECT)
     nop();
 }
 
 
 void MacroAssembler::Jump(Register target,
@@ skipping 3313 matching lines @@
 
 
 void MacroAssembler::TruncatingDiv(Register result,
                                    Register dividend,
                                    int32_t divisor) {
   DCHECK(!dividend.is(result));
   DCHECK(!dividend.is(at));
   DCHECK(!result.is(at));
   MultiplierAndShift ms(divisor);
   li(at, Operand(ms.multiplier()));
-  Mulh(result, dividend, Operand(at));
+  Mult(dividend, Operand(at));
+  mfhi(result);
   if (divisor > 0 && ms.multiplier() < 0) {
     Addu(result, result, Operand(dividend));
   }
   if (divisor < 0 && ms.multiplier() > 0) {
     Subu(result, result, Operand(dividend));
   }
   if (ms.shift() > 0) sra(result, result, ms.shift());
   srl(at, dividend, 31);
   Addu(result, result, Operand(at));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS