Hi,
this small addition improves costs of PARALLELs in
rtlanal.c:seq_cost(). Up to now, these costs are
assumed to be 1 which gives gross inexact costs for,
e.g. divmod which is represented as PARALLEL.
The patch just forwards cost computation to insn_rtx_cost
which uses the cost of the 1st SET (if any) and otherwise
assign costs of 1 insn.
Bootstrapped & regtested on x86_64.
Moreover, it fixed the division by constant on avr where
the problem popped up since PR79665.
Ok to install?
Johann
gcc/
PR middle-end/80929
* rtlanal.c (seq_cost) [PARALLEL]: Get cost from insn_rtx_cost
instead of assuming cost of 1.