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FPU: Normalize B operand for multiply-add instructions

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Otherwise the result can get rounded incorrectly when B is denorm but
the A * C product is much smaller.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras 2025-12-11 09:01:41 +11:00
parent d33f31509b
commit 37edba4da7
1 changed files with 1 additions and 0 deletions
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fpu.vhdl
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@ -1149,6 +1149,7 @@ begin
v.is_subtract := not (e_in.fra(63) xor e_in.frb(63) xor
e_in.frc(63) xor e_in.insn(1));
v.negate := e_in.insn(2);
v.do_renorm_b := '1';
when "10010" => -- fdiv
v.is_inverse := '1';
v.result_sign := e_in.fra(63) xor e_in.frb(63);