From 8eb86ab78d19cc9e97b09cd6107397221552817d Mon Sep 17 00:00:00 2001
From: Thomas Preud'homme <thomas.preudhomme@celest.fr>
Date: Thu, 6 May 2010 02:19:00 +0200
Subject: [PATCH] Add nan, snan and inf float constants

---
 tccgen.c | 25 +++++++++++++++++++++++++
 tcctok.h |  9 +++++++--
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/tccgen.c b/tccgen.c
index 6c8faa6b..bf171fb5 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -310,6 +310,16 @@ static void vpushll(long long v)
     vsetc(&ctype, VT_CONST, &cval);
 }
 
+/* push arbitrary 64bit constant */
+void vpush64(int ty, unsigned long long v)
+{
+    CValue cval;
+    CType ctype;
+    ctype.t = ty;
+    cval.ull = v;
+    vsetc(&ctype, VT_CONST, &cval);
+}
+
 /* Return a static symbol pointing to a section */
 ST_FUNC Sym *get_sym_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
 {
@@ -3535,6 +3545,21 @@ ST_FUNC void unary(void)
         vtop->sym = s;
         next();
         break;
+    
+    // special qnan , snan and infinity values
+    case TOK___NAN__:
+        vpush64(VT_DOUBLE, 0x7ff8000000000000);
+        next();
+        break;
+    case TOK___SNAN__:
+        vpush64(VT_DOUBLE, 0x7ff0000000000001);
+        next();
+        break;
+    case TOK___INF__:
+        vpush64(VT_DOUBLE, 0x7ff0000000000000);
+        next();
+        break;
+
     default:
     tok_identifier:
         t = tok;
diff --git a/tcctok.h b/tcctok.h
index 02ac7679..28c4236a 100644
--- a/tcctok.h
+++ b/tcctok.h
@@ -81,10 +81,15 @@
      DEF(TOK___TIME__, "__TIME__")
      DEF(TOK___FUNCTION__, "__FUNCTION__")
      DEF(TOK___VA_ARGS__, "__VA_ARGS__")
-     
+
 /* special identifiers */
      DEF(TOK___FUNC__, "__func__")
-     
+
+/* special floating point values */
+     DEF(TOK___NAN__, "__nan__")
+     DEF(TOK___SNAN__, "__snan__")
+     DEF(TOK___INF__, "__inf__")
+
 /* attribute identifiers */
 /* XXX: handle all tokens generically since speed is not critical */
      DEF(TOK_SECTION1, "section")
-- 
2.11.4.GIT