GNU C Library master sources branch master updated. glibc-2.21-186-g068a627

[jsm28 at sourceware dot org]

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- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=068a6274556f9f362443648f4fd47525c8cf2dba

commit 068a6274556f9f362443648f4fd47525c8cf2dba
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Mar 11 01:14:15 2015 +0000

    soft-fp: Add _FP_UNREACHABLE.
    
    This patch makes soft-fp use a new macro _FP_UNREACHABLE in place of
    calling abort in unreachable default cases of switch statements.
    _FP_UNREACHABLE expands to call __builtin_unreachable for GCC 4.5 and
    later; the fallback to abort is thus only for kernel use.
    
    Tested for powerpc-nofpu that installed stripped shared libraries are
    unchanged by this patch.  Also tested with the math/ tests for mips64
    (in the case of fma there *was* previously an abort call generated,
    unlike for the other operations - one switch only deals with a subset
    of classes for one operand based on what could have been generated in
    the earlier part of fma, whereas the other switches deal with all
    combinations of two classes - and this is apparently too complicated
    for the default case to have been optimized away).
    
    	* soft-fp/soft-fp.h (_FP_UNREACHABLE): New macro.
    	* soft-fp/op-common.h (_FP_MUL): Use _FP_UNREACHABLE instead of
    	abort.
    	(_FP_FMA): Likewise.
    	(_FP_DIV): Likewise.

diff --git a/ChangeLog b/ChangeLog
index da5c0ef..cea5b0e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2015-03-11  Joseph Myers  <joseph@codesourcery.com>
+
+	* soft-fp/soft-fp.h (_FP_UNREACHABLE): New macro.
+	* soft-fp/op-common.h (_FP_MUL): Use _FP_UNREACHABLE instead of
+	abort.
+	(_FP_FMA): Likewise.
+	(_FP_DIV): Likewise.
+
 2015-03-10  Roland McGrath  <roland@hack.frob.com>
 
 	* scripts/evaluate-test.sh: Grok exit code 77 as UNSUPPORTED and exit
diff --git a/soft-fp/op-common.h b/soft-fp/op-common.h
index 0a2f86a..83c2156 100644
--- a/soft-fp/op-common.h
+++ b/soft-fp/op-common.h
@@ -927,7 +927,7 @@
 	  break;						\
 								\
 	default:						\
-	  abort ();						\
+	  _FP_UNREACHABLE;					\
 	}							\
     }								\
   while (0)
@@ -1092,7 +1092,7 @@
 	  break;							\
 									\
 	default:							\
-	  abort ();							\
+	  _FP_UNREACHABLE;						\
 	}								\
 									\
       /* T = X * Y is zero, infinity or NaN.  */			\
@@ -1148,7 +1148,7 @@
 	  break;							\
 									\
 	default:							\
-	  abort ();							\
+	  _FP_UNREACHABLE;						\
 	}								\
     done_fma: ;								\
     }									\
@@ -1215,7 +1215,7 @@
 	  break;						\
 								\
 	default:						\
-	  abort ();						\
+	  _FP_UNREACHABLE;					\
 	}							\
     }								\
   while (0)
diff --git a/soft-fp/soft-fp.h b/soft-fp/soft-fp.h
index bb68df9..b247125 100644
--- a/soft-fp/soft-fp.h
+++ b/soft-fp/soft-fp.h
@@ -51,6 +51,15 @@
 # endif
 #endif
 
+/* For unreachable default cases in switch statements over bitwise OR
+   of FP_CLS_* values.  */
+#if (defined __GNUC__							\
+     && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)))
+# define _FP_UNREACHABLE	__builtin_unreachable ()
+#else
+# define _FP_UNREACHABLE	abort ()
+#endif
+
 /* In the Linux kernel, some architectures have a single function that
    uses different kinds of unpacking and packing depending on the
    instruction being emulated, meaning it is not readily visible to

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog           |    8 ++++++++
 soft-fp/op-common.h |    8 ++++----
 soft-fp/soft-fp.h   |    9 +++++++++
 3 files changed, 21 insertions(+), 4 deletions(-)


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