diff --git a/src/backend/x64/emit_x64_floating_point.cpp b/src/backend/x64/emit_x64_floating_point.cpp
index 028c281d..b06a9eeb 100644
--- a/src/backend/x64/emit_x64_floating_point.cpp
+++ b/src/backend/x64/emit_x64_floating_point.cpp
@@ -38,6 +38,8 @@ namespace {
 
 const Xbyak::Reg64 INVALID_REG = Xbyak::Reg64(-1);
 
+constexpr u64 f16_negative_zero = 0x8000;
+
 constexpr u64 f32_negative_zero = 0x80000000u;
 constexpr u64 f32_nan = 0x7fc00000u;
 constexpr u64 f32_non_sign_mask = 0x7fffffffu;
@@ -341,9 +343,18 @@ void EmitX64::EmitFPAbs64(EmitContext& ctx, IR::Inst* inst) {
     ctx.reg_alloc.DefineValue(inst, result);
 }
 
+void EmitX64::EmitFPNeg16(EmitContext& ctx, IR::Inst* inst) {
+    auto args = ctx.reg_alloc.GetArgumentInfo(inst);
+    const Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
+
+    code.pxor(result, code.MConst(xword, f16_negative_zero));
+
+    ctx.reg_alloc.DefineValue(inst, result);
+}
+
 void EmitX64::EmitFPNeg32(EmitContext& ctx, IR::Inst* inst) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
+    const Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
 
     code.pxor(result, code.MConst(xword, f32_negative_zero));
 
@@ -352,7 +363,7 @@ void EmitX64::EmitFPNeg32(EmitContext& ctx, IR::Inst* inst) {
 
 void EmitX64::EmitFPNeg64(EmitContext& ctx, IR::Inst* inst) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
+    const Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
 
     code.pxor(result, code.MConst(xword, f64_negative_zero));
 
diff --git a/src/frontend/ir/ir_emitter.cpp b/src/frontend/ir/ir_emitter.cpp
index 35c8d07b..75eb7b86 100644
--- a/src/frontend/ir/ir_emitter.cpp
+++ b/src/frontend/ir/ir_emitter.cpp
@@ -1880,11 +1880,17 @@ U32U64 IREmitter::FPMulX(const U32U64& a, const U32U64& b) {
     }
 }
 
-U32U64 IREmitter::FPNeg(const U32U64& a) {
-    if (a.GetType() == Type::U32) {
+U16U32U64 IREmitter::FPNeg(const U16U32U64& a) {
+    switch (a.GetType()) {
+    case Type::U16:
+        return Inst<U16>(Opcode::FPNeg16, a);
+    case Type::U32:
         return Inst<U32>(Opcode::FPNeg32, a);
-    } else {
+    case Type::U64:
         return Inst<U64>(Opcode::FPNeg64, a);
+    default:
+        UNREACHABLE();
+        return U16U32U64{};
     }
 }
 
diff --git a/src/frontend/ir/ir_emitter.h b/src/frontend/ir/ir_emitter.h
index 0e29d716..fa33d21a 100644
--- a/src/frontend/ir/ir_emitter.h
+++ b/src/frontend/ir/ir_emitter.h
@@ -303,7 +303,7 @@ public:
     U32U64 FPMul(const U32U64& a, const U32U64& b, bool fpcr_controlled);
     U32U64 FPMulAdd(const U32U64& addend, const U32U64& op1, const U32U64& op2, bool fpcr_controlled);
     U32U64 FPMulX(const U32U64& a, const U32U64& b);
-    U32U64 FPNeg(const U32U64& a);
+    U16U32U64 FPNeg(const U16U32U64& a);
     U32U64 FPRecipEstimate(const U32U64& a);
     U16U32U64 FPRecipExponent(const U16U32U64& a);
     U32U64 FPRecipStepFused(const U32U64& a, const U32U64& b);
diff --git a/src/frontend/ir/opcodes.inc b/src/frontend/ir/opcodes.inc
index ca87994a..81205e13 100644
--- a/src/frontend/ir/opcodes.inc
+++ b/src/frontend/ir/opcodes.inc
@@ -482,6 +482,7 @@ OPCODE(FPMulAdd32,                                          U32,            U32,
 OPCODE(FPMulAdd64,                                          U64,            U64,            U64,            U64                             )
 OPCODE(FPMulX32,                                            U32,            U32,            U32                                             )
 OPCODE(FPMulX64,                                            U64,            U64,            U64                                             )
+OPCODE(FPNeg16,                                             U16,            U16                                                             )
 OPCODE(FPNeg32,                                             U32,            U32                                                             )
 OPCODE(FPNeg64,                                             U64,            U64                                                             )
 OPCODE(FPRecipEstimate32,                                   U32,            U32                                                             )