gcc/ChangeLog
2014-03-16 Sebastian Huber <sebastian.hu...@embedded-brains.de>
* doc/invoke.texi (mapp-regs): Clarify.
---
gcc/doc/invoke.texi | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 24bd76e..485867d 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -20817,7 +20817,10 @@ These @samp{-m} options are supported on the SPARC:
@opindex mapp-regs
Specify @option{-mapp-regs} to generate output using the global registers
2 through 4, which the SPARC SVR4 ABI reserves for applications. This
-is the default.
+is the default. Like the global register 1 each global register 2 through 4 is
+then treated as an allocable register that is clobbered by function calls.
+They may be allocated for temporaries or variables that do not live across a
+call.
To be fully SVR4 ABI-compliant at the cost of some performance loss,
specify @option{-mno-app-regs}. You should compile libraries and system
--
1.8.1.4
