re PR target/36133 (GCC creates suboptimal ASM : Code includes unneeded TST instructions)

re PR target/36133 (GCC creates suboptimal ASM : Code includes unneeded TST instructions)

2008-11-19  Andrew Stubbs  <ams@codesourcery.com>

	gcc/
	PR target/36133
	* config/m68k/m68k.h (CC_OVERFLOW_UNUSABLE, CC_NO_CARRY): New defines.
	* config/m68k/m68k.c (notice_update_cc): Set cc_status properly for
	shift instructions.
	* config/m68k/m68k.md: Adjust all conditional branches that use the
	carry and overflow flags so they understand CC_OVERFLOW_UNUSABLE.

	gcc/testsuite/
	PR target/36133
	* gcc.target/m68k/pr36133.c: New test.

From-SVN: r141999