1 files changed, 27 insertions, 0 deletions
diff --git a/3/11_floating_point/50_fcvt2.c b/3/11_floating_point/50_fcvt2.c
new file mode 100644
index 0000000..052462e
--- /dev/null
+++ b/3/11_floating_point/50_fcvt2.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+// ip = rdi
+// fp = rsi
+// dp = rdx
+// l  = rcx
+// fcvt:
+//      movl            (%rdi), %eax                eax<-int value of ip to eax
+//      vmovss          (%rsi), %xmm0               xmm0<- move int value to float (vmov signed single?)
+//      vcvttsd2si      (%rdx), %r8d                r8d<- double value to signed integer?
+//      movl            %r8d, (%rdi)                *ip<- set pointer to truncated value of rdx
+//      vcvttsd2ss      %eax, %xmm1, %xmm1          xmm1<- convert int to float
+//      vmovss          %xmm1, (%rsi)               fp<-*ip
+//      vcvtsi2sdq      %rcx, %xmm1, %xmm1          xmm1<- convert long to double
+//      vmovsd          %xmm1, (%rdx)               dp<- l
+//      vunpcklps       %xmm0, %xmm0, %xmm0
+//      vcvtps2pd       %xmm0, %xmm0
+//      ret
+double fcvt2(int *ip, float *fp, double *dp, long l)
+{
+    int i = *ip; float f = *fp; double d = *dp;
+
+    *ip = (int)         d;
+    *fp = (float)       i;
+    *dp = (double)      l;
+    return (double)     f;
+}