1 files changed, 17 insertions, 0 deletions
diff --git a/winsup/mingw/mingwex/math/truncf.c b/winsup/mingw/mingwex/math/truncf.c
new file mode 100644
index 000000000..53fccb153
--- /dev/null
+++ b/winsup/mingw/mingwex/math/truncf.c
@@ -0,0 +1,17 @@
+#include <fenv.h>
+#include <math.h>
+
+float
+truncf (float _x){
+  float retval;
+  unsigned short saved_cw;
+  __asm__ ("fnstcw %0;": "=m" (saved_cw)); /* save FPU control word */
+  __asm__ ("fldcw %0;"
+	    :
+	    : "m" ((saved_cw & ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD
+			 | FE_TOWARDZERO)) | FE_TOWARDZERO)
+	);
+  __asm__ ("frndint;" : "=t" (retval)  : "0" (_x)); /* round towards zero */
+  __asm__ ("fldcw %0;" : : "m" (saved_cw) ); /* restore saved control word */
+  return retval;
+}