Hi all, There is a bug with the RNG intrinsics in their return code. The definition says:
"Stores a 64-bit random number into the object pointed to by the argument and
returns zero.
If the implementation could not generate a random number within a reasonable
period of time
the object pointed to by the input is set to zero and a non-zero value is
returned."
This means we should be testing whether to return non-zero with:
CSET W0, EQ
rather than NE.
This patch fixes that.
Bootstrapped and tested on aarch64-none-linux-gnu.
Pushing to master and the branches later.
gcc/ChangeLog:
* config/aarch64/aarch64-builtins.c (aarch64_expand_rng_builtin): Use EQ
to compare against CC_REG rather than NE.
gcc/testsuite/ChangeLog:
* gcc.target/aarch64/acle/rng_2.c: New test.
rng.patch
Description: rng.patch
