[libc-commits] [libc] e37bd6c - [libc][fenv] Add missing FE_* definitions for some environment. (#91519)

[via libc-commits]

Author: lntue
Date: 2024-05-08T17:32:05-04:00
New Revision: e37bd6c68b50a556ff0e9261cf9eba64afa06bf9

URL: https://github.com/llvm/llvm-project/commit/e37bd6c68b50a556ff0e9261cf9eba64afa06bf9
DIFF: https://github.com/llvm/llvm-project/commit/e37bd6c68b50a556ff0e9261cf9eba64afa06bf9.diff

LOG: [libc][fenv] Add missing FE_* definitions for some environment. (#91519)

Added: 
    

Modified: 
    libc/hdr/fenv_macros.h

Removed: 
    


################################################################################
diff  --git a/libc/hdr/fenv_macros.h b/libc/hdr/fenv_macros.h
index 041fca5f224b3..a2e4462ef02dc 100644
--- a/libc/hdr/fenv_macros.h
+++ b/libc/hdr/fenv_macros.h
@@ -17,10 +17,51 @@
 
 #include <fenv.h>
 
+// In some environment, FE_ALL_EXCEPT is set to 0 and the remaining exceptions
+// FE_* are missing.
+#if (FE_ALL_EXCEPT == 0)
+#ifndef FE_DIVBYZERO
+#define FE_DIVBYZERO 0
+#endif // FE_DIVBYZERO
+
+#ifndef FE_INEXACT
+#define FE_INEXACT 0
+#endif // FE_INEXACT
+
+#ifndef FE_INVALID
+#define FE_INVALID 0
+#endif // FE_INVALID
+
+#ifndef FE_OVERFLOW
+#define FE_OVERFLOW 0
+#endif // FE_OVERFLOW
+
+#ifndef FE_UNDERFLOW
+#define FE_UNDERFLOW 0
+#endif // FE_UNDERFLOW
+#else
 // If this is not provided by the system, define it for use internally.
 #ifndef __FE_DENORM
 #define __FE_DENORM (1 << 6)
 #endif
+#endif
+
+// Rounding mode macros might be missing.
+#ifndef FE_DOWNWARD
+#define FE_DOWNWARD 0x400
+#endif // FE_DOWNWARD
+
+#ifndef FE_TONEAREST
+#define FE_TONEAREST 0
+#endif // FE_TONEAREST
+
+#ifndef FE_TOWARDZERO
+#define FE_TOWARDZERO 0xC00
+#endif // FE_TOWARDZERO
+
+#ifndef FE_UPWARD
+#define FE_UPWARD 0x800
+#endif // FE_UPWARD
 
 #endif // LLVM_LIBC_FULL_BUILD