[wasm] Define the FP return register for X87.

src/compiler/wasm-linkage.cc

 // Copyright 2015 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 "src/assembler.h"
 #include "src/macro-assembler.h"
 
 #include "src/wasm/wasm-module.h"
 
 #include "src/compiler/linkage.h"
@@ skipping 60 matching lines @@
 #define GP_RETURN_REGISTERS rax, rdx
 #define FP_PARAM_REGISTERS xmm1, xmm2, xmm3, xmm4, xmm5, xmm6
 #define FP_RETURN_REGISTERS xmm1, xmm2
 
 #elif V8_TARGET_ARCH_X87
 // ===========================================================================
 // == x87 ====================================================================
 // ===========================================================================
 #define GP_PARAM_REGISTERS eax, edx, ecx, ebx, esi, edi
 #define GP_RETURN_REGISTERS eax, edx
+#define FP_RETURN_REGISTERS stX_0
 
 #elif V8_TARGET_ARCH_ARM
 // ===========================================================================
 // == arm ====================================================================
 // ===========================================================================
 #define GP_PARAM_REGISTERS r0, r1, r2, r3
 #define GP_RETURN_REGISTERS r0, r1
 #define FP_PARAM_REGISTERS d0, d1, d2, d3, d4, d5, d6, d7
 #define FP_RETURN_REGISTERS d0, d1
 
@@ skipping 181 matching lines @@
       params.stack_offset,                // stack_parameter_count
       compiler::Operator::kNoProperties,  // properties
       kCalleeSaveRegisters,               // callee-saved registers
       kCalleeSaveFPRegisters,             // callee-saved fp regs
       CallDescriptor::kUseNativeStack,    // flags
       "c-call");
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8