Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys.

sdk/lib/crt/math/amd64/ceilf.S

@@ -0,0 +1,51 @@
+/*
+ * COPYRIGHT:         See COPYING in the top level directory
+ * PROJECT:           ReactOS system libraries
+ * PURPOSE:           Implementation of tan
+ * FILE:              lib/sdk/crt/math/amd64/ceilf.S
+ * PROGRAMMER:        Timo Kreuzer (timo.kreuzer@reactos.org)
+ */
+
+/* INCLUDES ******************************************************************/
+
+#include <asm.inc>
+#include <ksamd64.inc>
+
+/* CODE **********************************************************************/
+.code64
+
+PUBLIC ceilf
+FUNC ceilf
+    sub rsp, 16
+    .ENDPROLOG
+
+    /* Duplicate the bits into eax (zero exteneded to rax) */
+    movd eax, xmm0
+
+    /* Invert the sign bit */
+    xor eax, HEX(80000000)
+
+    /* Copy back to xmm0 */
+    movd xmm0, eax
+
+    /* Truncate xmm0 to integer (single precision) */
+    cvttss2si rcx, xmm0
+
+    /* Shift all bits to the right, keeping the sign bit */
+    shr rax, 31
+
+    /* Add the sign bit from the truncated value, so that
+       we get the correct result for negative values. */
+    add rcx, rax
+
+    /* Now compensate for the previous negation */
+    neg ecx
+
+    /* Convert the result back to xmm0 (single precision) */
+    cvtsi2ss xmm0, rcx
+
+    add rsp, 16
+    ret
+ENDFUNC
+
+END