http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60776
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |krebbel at gcc dot gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Andreas, that's very likely caused by your change to the testcase. For some
reason I see two adjacent
(insn 11 10 28 2 (set (reg:CCZ 17 flags)
(compare:CCZ (reg:SI 84 [ D.1826 ])
(reg:SI 85 [ D.1826 ])))
/space/rguenther/src/svn/trunk/gcc/testsuite/gcc.dg/builtin-bswap-6.c:37 7
{*cmpsi_1}
(expr_list:REG_UNUSED (reg:CCZ 17 flags)
(nil)))
(insn 28 11 29 2 (set (reg:CCZ 17 flags)
(compare:CCZ (reg:SI 84 [ D.1826 ])
(reg:SI 85 [ D.1826 ])))
/space/rguenther/src/svn/trunk/gcc/testsuite/gcc.dg/builtin-bswap-6.c:39 7
{*cmpsi_1}
(expr_list:REG_DEAD (reg:SI 85 [ D.1826 ])
(expr_list:REG_DEAD (reg:SI 84 [ D.1826 ])
(nil))))
and thus the bswaps are no longer single-use. Eventually we relied on
if-conversion doing some magic here which the testcase change disabled?
