This fixed a typo. Checked into trunk.
H.J.
---
Index: gcc/ChangeLog
===================================================================
--- gcc/ChangeLog (revision 235274)
+++ gcc/ChangeLog (working copy)
@@ -1,3 +1,7 @@
+2016-04-20 H.J. Lu <hongjiu...@intel.com>
+
+ * doc/invoke.texi: Replace -skip-rax-setup with -mskip-rax-setup.
+
2016-04-20 Richard Biener <rguent...@suse.de>
* gimple-match.h (maybe_build_generic_op): Adjust prototype.
Index: gcc/doc/invoke.texi
===================================================================
--- gcc/doc/invoke.texi (revision 235274)
+++ gcc/doc/invoke.texi (working copy)
@@ -24157,7 +24157,7 @@ useful together with @option{-mrecord-mc
@itemx -mno-skip-rax-setup
@opindex mskip-rax-setup
When generating code for the x86-64 architecture with SSE extensions
-disabled, @option{-skip-rax-setup} can be used to skip setting up RAX
+disabled, @option{-mskip-rax-setup} can be used to skip setting up RAX
register when there are no variable arguments passed in vector registers.
@strong{Warning:} Since RAX register is used to avoid unnecessarily
