On 09/04/14 22:04, Kugan wrote:
Hi All,
For the bswap built-in, there are unnecessary uxts generated as reported
in pr43550. Can we rely on the argument being unsigned and set the
SUBREG promoted accordingly.
At least in ARM ABI, arguments are supposed to be properly zero/sign
extended.
Any thoughts?
Bootstrapped and regression tested on x86_64 and arm.
Thanks,
Kugan
gcc/testsuite
2014-09-05 Kugan Vivekanandarajah <kug...@linaro.org>
PR target/43550
* gcc.target/arm/pr43550.c: New test.
gcc/
2014-09-05 Kugan Vivekanandarajah <kug...@linaro.org>
PR target/43550
* builtins.c (expand_builtin_bswap): Generate promoted subreg.
I'm not 100% sure you can depend on arguments being extended. It'll
often be true, but I don't think it's something you can rely on.
Jeff
