MIPS: [turbofan] Add TruncateFloat32ToUint32 operator to Turbofan.

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.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/base/bits.h"
@@ skipping 1360 matching lines @@
 }
 
 
 void MacroAssembler::Trunc_uw_d(FPURegister fd,
                                 FPURegister fs,
                                 FPURegister scratch) {
   Trunc_uw_d(fs, t8, scratch);
   mtc1(t8, fd);
 }
 
+void MacroAssembler::Trunc_uw_s(FPURegister fd, FPURegister fs,
+                                FPURegister scratch) {
+  Trunc_uw_s(fs, t8, scratch);
+  mtc1(t8, fd);
+}
 
 void MacroAssembler::Trunc_w_d(FPURegister fd, FPURegister fs) {
   if (IsMipsArchVariant(kLoongson) && fd.is(fs)) {
     Mfhc1(t8, fs);
     trunc_w_d(fd, fs);
     Mthc1(t8, fs);
   } else {
     trunc_w_d(fd, fs);
   }
 }
@@ skipping 57 matching lines @@
   Label done;
   Branch(&done);
   // Simple conversion.
   bind(&simple_convert);
   trunc_w_d(scratch, fd);
   mfc1(rs, scratch);
 
   bind(&done);
 }
 
+void MacroAssembler::Trunc_uw_s(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, 0x4F000000);
+  mtc1(at, scratch);
+  // Test if scratch > fd.
+  // If fd < 2^31 we can convert it normally.
+  Label simple_convert;
+  BranchF32(&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_s(scratch, fd, scratch);
+  trunc_w_s(scratch, scratch);
+  mfc1(rs, scratch);
+  Or(rs, rs, 1 << 31);
+
+  Label done;
+  Branch(&done);
+  // Simple conversion.
+  bind(&simple_convert);
+  trunc_w_s(scratch, fd);
+  mfc1(rs, scratch);
+
+  bind(&done);
+}
 
 void MacroAssembler::Mthc1(Register rt, FPURegister fs) {
   if (IsFp32Mode()) {
     mtc1(rt, fs.high());
   } else {
     DCHECK(IsFp64Mode() || IsFpxxMode());
     DCHECK(IsMipsArchVariant(kMips32r2) || IsMipsArchVariant(kMips32r6));
     mthc1(rt, fs);
   }
 }
@@ skipping 4367 matching lines @@
   if (mag.shift > 0) sra(result, result, mag.shift);
   srl(at, dividend, 31);
   Addu(result, result, Operand(at));
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS