Revert of [turbofan] Implement rounding of floats on x64 and ia32 without sse4.1.

src/ia32/macro-assembler-ia32.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.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 563 matching lines @@
 
 void MacroAssembler::DebugBreak() {
   Move(eax, Immediate(0));
   mov(ebx, Immediate(ExternalReference(Runtime::kHandleDebuggerStatement,
                                        isolate())));
   CEntryStub ces(isolate(), 1);
   call(ces.GetCode(), RelocInfo::DEBUGGER_STATEMENT);
 }
 
 
-void MacroAssembler::Cvtsi2ss(XMMRegister dst, const Operand& src) {
-  xorps(dst, dst);
-  cvtsi2ss(dst, src);
-}
-
-
 void MacroAssembler::Cvtsi2sd(XMMRegister dst, const Operand& src) {
   xorps(dst, dst);
   cvtsi2sd(dst, src);
 }
 
 
-void MacroAssembler::Roundss(XMMRegister dst, XMMRegister src, Register tmp,
-                             RoundingMode mode) {
-  if (CpuFeatures::IsSupported(SSE4_1)) {
-    CpuFeatureScope sse_scope(this, SSE4_1);
-    roundss(dst, src, mode);
-  } else {
-    // We have to store the original rounding mode to restore it later.
-    {
-      sub(esp, Immediate(kPointerSize * 2));
-      stmxcsr(Operand(esp, 0));
-      mov(tmp, Operand(esp, 0));
-      and_(tmp, Immediate(0xffff9fff));
-      or_(tmp, Immediate(mode << 13));
-      mov(Operand(esp, kPointerSize), tmp);
-      ldmxcsr(Operand(esp, kPointerSize));
-    }
-
-    // Do rounding by conversion to int.
-    cvtss2si(tmp, src);
-
-    Label out_of_range;
-    Label done;
-    // Check whether the input is within int32 range.
-    cmp(tmp, Immediate(1));
-    j(overflow, &out_of_range);
-    // If the conversion results in INT_MIN, then the input is outside
-    // int range, and due to the limited precision of float32 this means
-    // that the input must have been an integer already. We are therefore
-    // done already.
-    cvtsi2ss(dst, tmp);
-    if (!dst.is(src)) {
-      jmp(&done);
-    }
-
-    bind(&out_of_range);
-    if (!dst.is(src)) {
-      movss(dst, src);
-    }
-
-    bind(&done);
-    // Restore the original rounding mode.
-    ldmxcsr(Operand(esp, 0));
-    add(esp, Immediate(kPointerSize * 2));
-  }
-}
-
-
-void MacroAssembler::Roundsd(XMMRegister dst, XMMRegister src, Register tmp,
-                             XMMRegister xtmp, RoundingMode mode) {
-  if (CpuFeatures::IsSupported(SSE4_1)) {
-    CpuFeatureScope sse_scope(this, SSE4_1);
-    roundsd(dst, src, mode);
-  } else {
-    // We have to store the original rounding mode to restore it later.
-    {
-      sub(esp, Immediate(kPointerSize * 2));
-      stmxcsr(Operand(esp, 0));
-      mov(tmp, Operand(esp, 0));
-      and_(tmp, Immediate(0xffff9fff));
-      or_(tmp, Immediate(mode << 13));
-      mov(Operand(esp, kPointerSize), tmp);
-      ldmxcsr(Operand(esp, kPointerSize));
-    }
-
-    // Convert the input to int32.
-    cvtsd2si(tmp, src);
-
-    Label out_of_range;
-    Label done;
-    // Check whether the input is within int32 range.
-    cmp(tmp, Immediate(1));
-    j(overflow, &out_of_range);
-    // The input is within int32 range. We achieve rounding by converting
-    // back to float.
-    Cvtsi2sd(dst, tmp);
-    jmp(&done);
-    bind(&out_of_range);
-    if (!dst.is(src)) {
-      movsd(dst, src);
-    }
-    // If the input is outside [-2^52, 2^52], then the result = input.
-    int64_t offset = 1;
-    offset <<= 52;
-    Move(xtmp, static_cast<double>(offset));
-
-    ucomisd(xtmp, src);
-
-    j(below_equal, &done);
-
-    Move(xtmp, static_cast<double>(-offset));
-
-    ucomisd(xtmp, src);
-    j(above_equal, &done);
-
-    // Positive number have to be handled differently than negative numbers.
-    xorpd(xtmp, xtmp);
-    ucomisd(xtmp, src);
-
-    Move(xtmp, static_cast<double>(offset));
-
-    Label below_zero;
-    j(above, &below_zero);
-
-    addsd(dst, xtmp);
-    subsd(dst, xtmp);
-    jmp(&done);
-
-    bind(&below_zero);
-    subsd(dst, xtmp);
-    addsd(dst, xtmp);
-
-    bind(&done);
-    // Restore the original rounding mode.
-    ldmxcsr(Operand(esp, 0));
-    add(esp, Immediate(kPointerSize * 2));
-  }
-}
-
-
 bool MacroAssembler::IsUnsafeImmediate(const Immediate& x) {
   static const int kMaxImmediateBits = 17;
   if (!RelocInfo::IsNone(x.rmode_)) return false;
   return !is_intn(x.x_, kMaxImmediateBits);
 }
 
 
 void MacroAssembler::SafeMove(Register dst, const Immediate& x) {
   if (IsUnsafeImmediate(x) && jit_cookie() != 0) {
     Move(dst, Immediate(x.x_ ^ jit_cookie()));
@@ skipping 2516 matching lines @@
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32