[libc-commits] [libc] d5f0634 - [libc] add flag for FP_*LOGB0/NAN values (#86723)

[via libc-commits]

Author: Michael Jones
Date: 2024-03-27T15:09:57-07:00
New Revision: d5f06342a3007f414c783ba42cb49453a9cee835

URL: https://github.com/llvm/llvm-project/commit/d5f06342a3007f414c783ba42cb49453a9cee835
DIFF: https://github.com/llvm/llvm-project/commit/d5f06342a3007f414c783ba42cb49453a9cee835.diff

LOG: [libc] add flag for FP_*LOGB0/NAN values (#86723)

These values vary by system, this flag allows you to toggle their value.

Added: 
    

Modified: 
    libc/include/llvm-libc-macros/math-macros.h
    utils/bazel/llvm-project-overlay/libc/BUILD.bazel

Removed: 
    


################################################################################
diff  --git a/libc/include/llvm-libc-macros/math-macros.h b/libc/include/llvm-libc-macros/math-macros.h
index 03c7a823e6e96b..1497e32044e975 100644
--- a/libc/include/llvm-libc-macros/math-macros.h
+++ b/libc/include/llvm-libc-macros/math-macros.h
@@ -31,10 +31,15 @@
 #define NAN __builtin_nanf("")
 
 #define FP_ILOGB0 (-INT_MAX - 1)
-#define FP_ILOGBNAN INT_MAX
-
 #define FP_LLOGB0 (-LONG_MAX - 1)
+
+#ifdef __FP_LOGBNAN_MIN
+#define FP_ILOGBNAN (-INT_MAX - 1)
+#define FP_LLOGBNAN (-LONG_MAX - 1)
+#else
+#define FP_ILOGBNAN INT_MAX
 #define FP_LLOGBNAN LONG_MAX
+#endif
 
 #ifdef __FAST_MATH__
 #define math_errhandling 0

diff  --git a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
index eb0afbb6dd6ffe..acdf9349fd5868 100644
--- a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
@@ -68,6 +68,7 @@ libc_support_library(
     name = "llvm_libc_macros_math_macros",
     hdrs = ["include/llvm-libc-macros/math-macros.h"],
     deps = [":llvm_libc_macros_limits_macros"],
+    defines = ["__FP_LOGBNAN_MIN"],
 )
 
 libc_support_library(