From ad3c8cc8934ec89631c221713b86238f6c86e1b6 Mon Sep 17 00:00:00 2001
From: Tanner Gooding <tagoo@outlook.com>
Date: Thu, 30 Aug 2018 10:09:59 -0700
Subject: Updating Number.Formatting to properly print -0

---
 src/pal/inc/pal.h             |  2 ++
 src/pal/src/cruntime/math.cpp | 56 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)

(limited to 'src/pal')

diff --git a/src/pal/inc/pal.h b/src/pal/inc/pal.h
index e7ec886e87..2d0c47177b 100644
--- a/src/pal/inc/pal.h
+++ b/src/pal/inc/pal.h
@@ -4459,6 +4459,7 @@ PALIMPORT LONG __cdecl labs(LONG);
 // clang complains if this is declared with __int64
 PALIMPORT long long __cdecl llabs(long long);
 
+PALIMPORT int __cdecl _signbit(double);
 PALIMPORT int __cdecl _finite(double);
 PALIMPORT int __cdecl _isnan(double);
 PALIMPORT double __cdecl _copysign(double, double);
@@ -4487,6 +4488,7 @@ PALIMPORT double __cdecl sqrt(double);
 PALIMPORT double __cdecl tan(double);
 PALIMPORT double __cdecl tanh(double);
 
+PALIMPORT int __cdecl _signbitf(float);
 PALIMPORT int __cdecl _finitef(float);
 PALIMPORT int __cdecl _isnanf(float);
 PALIMPORT float __cdecl _copysignf(float, float);
diff --git a/src/pal/src/cruntime/math.cpp b/src/pal/src/cruntime/math.cpp
index a36ac9aa93..af2f99416e 100644
--- a/src/pal/src/cruntime/math.cpp
+++ b/src/pal/src/cruntime/math.cpp
@@ -43,6 +43,34 @@ Abstract:
 
 SET_DEFAULT_DEBUG_CHANNEL(CRT);
 
+/*++
+Function:
+  _signbit
+
+Determines whether given double-precision floating point value has a negative sign.
+
+Return Value
+
+_signbit returns a nonzero value (TRUE) if the sign of its argument x is negative.
+
+Parameter
+
+x  Double-precision floating-point value
+
+--*/
+int __cdecl _signbit(double x)
+{
+    int ret;
+    PERF_ENTRY(_signbit);
+    ENTRY("_signbit (x=%f)\n", x);
+
+    ret = signbit(x);
+
+    LOGEXIT("_signbit returns int %d\n", ret);
+    PERF_EXIT(_signbit);
+    return ret;
+}
+
 /*++
 Function:
   _finite
@@ -453,6 +481,34 @@ PALIMPORT double __cdecl PAL_pow(double x, double y)
     return ret;
 }
 
+/*++
+Function:
+  _signbitf
+
+Determines whether given single-precision floating point value has a negative sign.
+
+Return Value
+
+_signbitf returns a nonzero value (TRUE) if the sign of its argument x is negative.
+
+Parameter
+
+x  Single-precision floating-point value
+
+--*/
+int __cdecl _signbitf(float x)
+{
+    int ret;
+    PERF_ENTRY(_signbitf);
+    ENTRY("_signbitf (x=%f)\n", x);
+
+    ret = signbit(x);
+
+    LOGEXIT("_signbitf returns int %d\n", ret);
+    PERF_EXIT(_signbitf);
+    return ret;
+}
+
 /*++
 Function:
   _finitef
-- 
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