On 7/20/24 11:27 AM, Georg-Johann Lay wrote:
Hi Jeff,
at least combiner patterns won't work. For something like
var |= 1 << (off & 7)
insn combine is just getting lost; it tries expressions with
MEM, IOR, even PARALLELs, but nothing that's close to a rotation.
Also it doesn't break out m
Am 19.07.24 um 16:56 schrieb Jeff Law:
On 7/18/24 3:12 PM, Georg-Johann Lay wrote:
This new builtin provides a faster way to compute
expressions like 1 << x or ~(1 << x) that are sometimes
used as masks for setting bits in the I/O region, and when
x is not known at compile-time.
The open code
On 7/18/24 3:12 PM, Georg-Johann Lay wrote:
This new builtin provides a faster way to compute
expressions like 1 << x or ~(1 << x) that are sometimes
used as masks for setting bits in the I/O region, and when
x is not known at compile-time.
The open coded C expression takes 5 + 4 * x cycles
This new builtin provides a faster way to compute
expressions like 1 << x or ~(1 << x) that are sometimes
used as masks for setting bits in the I/O region, and when
x is not known at compile-time.
The open coded C expression takes 5 + 4 * x cycles to compute an
8-bit result, whereas the builtin
