gcc/gcc/testsuite/gcc.target/m68k/pr36133.c at 1afac9a69f639e50d22c95acd976b53d47c56e4e - procyberian/gcc - Masscollabs Services: Beyond Sharing , Liberating The Software World

procyberian/gcc

Andrew Stubbs 1afac9a69f 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

2008-11-19 11:23:28 +00:00

16 lines

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 /* pr36133.c
    This test ensures that conditional branches can use the condition codes
    written by shift instructions, without the need for an extra TST.  */
 /* { dg-do compile }  */
 /* { dg-options "-O2" }  */
 /* { dg-final { scan-assembler-not "tst" } } */
 void
 f (unsigned int a)
 {
   if (a >> 4)
     asm volatile ("nop");
   asm volatile ("nop");
 }