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execute1: Ease timing on redirect_nia

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This eliminates a dependency of r.f.redirect_nia on the carry out
from the main adder in the case of a conditional trap instruction.
We can set r.f.redirect_nia unconditionally, even if no interrupt
is generated.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras 2020-07-10 19:07:47 +10:00
parent 31587affb3
commit 9160e29c56
1 changed files with 3 additions and 3 deletions
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6
execute1.vhdl
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@ -619,12 +619,12 @@ begin
end loop;
else
-- trap instructions (tw, twi, td, tdi)
v.f.redirect_nia := std_logic_vector(to_unsigned(16#700#, 64));
-- set bit 46 to say trap occurred
ctrl_tmp.srr1(63 - 46) <= '1';
if or (trapval and insn_to(e_in.insn)) = '1' then
-- generate trap-type program interrupt
exception := '1';
v.f.redirect_nia := std_logic_vector(to_unsigned(16#700#, 64));
-- set bit 46 to say trap occurred
ctrl_tmp.srr1(63 - 46) <= '1';
report "trap";
end if;
end if;