WIP

compiler/ccgstmts.nim

@@ -1547,14 +1547,14 @@ proc genAsmStmt(p: BProc, t: PNode) =
       if whichPragma(i) == wAsmSyntax:
         asmSyntax = i[1].strVal
 
-  if asmSyntax != "" and 
+  if asmSyntax != "" and
      not (
       asmSyntax == "gcc" and hasGnuAsm in CC[p.config.cCompiler].props or
       asmSyntax == "vcc" and hasGnuAsm notin CC[p.config.cCompiler].props):
     localError(
-      p.config, t.info, 
+      p.config, t.info,
       "Your compiler does not support the specified inline assembler")
-  
+
   genAsmOrEmitStmt(p, t, isAsmStmt=true, s)
   # see bug #2362, "top level asm statements" seem to be a mis-feature
   # but even if we don't do this, the example in #2362 cannot possibly

lib/nimbase.h

@@ -594,4 +594,30 @@ NIM_STATIC_ASSERT(sizeof(NI) == sizeof(void*) && NIM_INTBITS == sizeof(NI)*8, "P
 #define NIM_NOALIAS __restrict
 /* __restrict is said to work for all the C(++) compilers out there that we support */
 
+#if defined(__GNUC__)
+#  define NIM_ERR_FLAG()  /* nothing to declare: uses HW flag */
+#  define NIM_ERR_JUMP(lab)  __asm__ goto("jc %l0" \
+               : \
+               : \
+               : \
+               : lab)
+#  define NIM_ERR_SET()   __asm__ volatile("stc" \
+    : \
+    : \
+    : "cc" \
+    )
+
+#  define NIM_ERR_CLEAR() __asm__ volatile("clc" \
+    : \
+    : \
+    : "cc" \
+    )
+
+#else
+#  define NIM_ERR_FLAG()  NIM_BOOL* nimErr_
+#  define NIM_ERR_JUMP(lab) if (NIM_UNLIKELY(*nimErr_)) goto lab
+#  define NIM_ERR_CLEAR() *nimErr_ = NIM_FALSE
+#  define NIM_ERR_SET() *nimErr_ = NIM_TRUE
+#endif /* __GNUC__ */
+
 #endif /* NIMBASE_H */