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FPU: Make convert-to-integer-word instructions behave like P9

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The fctiw* instructions return a copy of the value in bits 31..0 in
bits 63..32 of the result on P9, rather than a sign or zero extension
of the word result.  Make the FPU do the same.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras
2025-12-06 18:09:20 +11:00
parent 82825a11ba
commit ca792f3b13
1 changed files with 6 additions and 1 deletions
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7
fpu.vhdl
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@@ -1625,6 +1625,7 @@ begin
re_set_result <= '1';
rs_sel1 <= RSH1_B;
rs_neg2 <= '1';
v.single_prec := not r.insn(9);
if r.b.exponent >= to_signed(64, EXP_BITS) or
(r.insn(9) = '0' and r.b.exponent >= to_signed(32, EXP_BITS)) then
@@ -3686,7 +3687,8 @@ begin
if r.fp_rc = '1' then
v.cr_result := v.fpscr(FPSCR_FX downto FPSCR_OX);
end if;
v.sp_result := r.single_prec;
-- set sp_result for fctiw*
v.sp_result := r.single_prec and not r.integer_op;
v.res_int := r.int_result or r.integer_op;
v.illegal := illegal;
v.nsnan_result := r.quieten_nan;
@@ -3720,6 +3722,9 @@ begin
-- This mustn't depend on any fields of r that are modified in IDLE state.
if r.res_int = '1' then
fp_result <= r.r;
if r.sp_result = '1' then
fp_result(63 downto 32) <= r.r(31 downto 0);
end if;
else
fp_result <= pack_dp(r.res_sign, r.result_class, r.result_exp, r.r,
r.sp_result, r.nsnan_result);