Implement instruction cvttps2pi

src/instructions.js

@@ -2122,7 +2122,39 @@ t[0x2B] = cpu => {
         cpu.safe_write128(addr, data[0], data[1], data[2], data[3]);
     }
  };
-t[0x2C] = cpu => { cpu.unimplemented_sse(); };
+t[0x2C] = cpu => {
+    // cvttps2pi mm, xmm/m64
+    dbg_assert((cpu.prefixes & (PREFIX_MASK_REP | PREFIX_MASK_OPSIZE)) === 0);
+    cpu.task_switch_test_mmx();
+    cpu.read_modrm_byte();
+
+    let data = cpu.read_xmm_mem64s();
+    let float32 = new Float32Array(data.buffer);
+    let low = 0;
+    let high = 0;
+
+    var res0 = Math.trunc(float32[0]);
+    if(res0 <= 0x7FFFFFFF && res0 >= -0x80000000)
+    {
+        low = res0;
+    }
+    else
+    {
+        low = 0x80000000|0;
+    }
+
+    var res1 = Math.trunc(float32[1]);
+    if(res1 <= 0x7FFFFFFF && res1 >= -0x80000000)
+    {
+        high = res1;
+    }
+    else
+    {
+        high = 0x80000000|0;
+    }
+
+    cpu.write_mmx64s(low, high);
+};
 t[0x2D] = cpu => { cpu.unimplemented_sse(); };
 t[0x2E] = cpu => { cpu.unimplemented_sse(); };
 t[0x2F] = cpu => { cpu.unimplemented_sse(); };

tests/nasm/cvttps2pi.asm

@@ -0,0 +1,31 @@
+global _start
+
+section .data
+	align 16
+float0low:
+	dd	2147483647.0
+float0high:
+	dd	-2147483648.0
+float1low:
+	dd	1235.678
+float1high:
+	dd	1325400064
+float2low:
+	dd	-54.321
+float2high:
+	dd	-12345.6
+float3low:
+	dd	123.456
+float3high:
+	dd	1234.5678
+myaddress:
+	dd	0xdeadbeef
+%include "header.inc"
+
+    movaps	    xmm0, [float0low]
+    cvttps2pi	mm0, xmm0
+	cvttps2pi	mm1, [float1low]
+	cvttps2pi	mm2, [float2low]
+	cvttps2pi	mm3, [float3low]
+
+%include "footer.inc"