match: Disable `(type)zero_one_valuep*CST` for 1bit signed types [PR115154]

The problem here is the pattern added in r13-1162-g9991d84d2a8435
assumes that it is well defined to multiply zero_one_valuep by the truncated
converted integer constant. It is well defined for all types except for signed 1bit types.
Where `a * -1` is produced which is undefined/
So disable this pattern for 1bit signed types.

Note the pattern added in r14-3432-gddd64a6ec3b38e is able to workaround the undefinedness except when
`-fsanitize=undefined` is turned on, this is why I added a testcase for that.

Bootstrapped and tested on x86_64-linux-gnu with no regressions.

	PR tree-optimization/115154

gcc/ChangeLog:

	* match.pd (convert (mult zero_one_valued_p@1 INTEGER_CST@2)): Disable
	for 1bit signed types.

gcc/testsuite/ChangeLog:

	* c-c++-common/ubsan/signed1bitfield-1.c: New test.
	* gcc.c-torture/execute/signed1bitfield-1.c: New test.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>

0 files changed, 0 insertions, 0 deletions