ppc: [liftoff] fix Float copysign operation

Change-Id: Icdef3916993e14e39ef9da70af128b9fde2d3b60
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3158323Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#76797}

src/codegen/ppc/macro-assembler-ppc.cc

@@ -3056,6 +3056,11 @@ void TurboAssembler::DivF32(DoubleRegister dst, DoubleRegister lhs,
   frsp(dst, dst, r);
 }
 
+void TurboAssembler::CopySignF64(DoubleRegister dst, DoubleRegister lhs,
+                                 DoubleRegister rhs, RCBit r) {
+  fcpsgn(dst, rhs, lhs, r);
+}
+
 void MacroAssembler::CmpSmiLiteral(Register src1, Smi smi, Register scratch,
                                    CRegister cr) {
 #if defined(V8_COMPRESS_POINTERS) || defined(V8_31BIT_SMIS_ON_64BIT_ARCH)

src/codegen/ppc/macro-assembler-ppc.h

@@ -279,6 +279,8 @@ class V8_EXPORT_PRIVATE TurboAssembler : public TurboAssemblerBase {
               RCBit r = LeaveRC);
   void DivF32(DoubleRegister dst, DoubleRegister lhs, DoubleRegister rhs,
               RCBit r = LeaveRC);
+  void CopySignF64(DoubleRegister dst, DoubleRegister lhs, DoubleRegister rhs,
+                   RCBit r = LeaveRC);
 
   void Push(Register src) { push(src); }
   // Push a handle.

src/execution/ppc/simulator-ppc.cc

@@ -3688,7 +3688,7 @@ void Simulator::ExecuteGeneric(Instruction* instr) {
       int fra = instr->RAValue();
       double frb_val = get_double_from_d_register(frb);
       double fra_val = get_double_from_d_register(fra);
-      double frt_val = std::copysign(fra_val, frb_val);
+      double frt_val = std::copysign(frb_val, fra_val);
       set_d_register_from_double(frt, frt_val);
       return;
     }