🐛 Use correct round mode in FMA underflow detection (#137)

* 🐛 Use correct round mode in multi FMA of/uf detection * 🐛 Use correct round mode in FMA of/uf detection
openhwgroup · Aug 2, 2024 · a6af691 · a6af691
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diff --git a/src/fpnew_fma.sv b/src/fpnew_fma.sv
@@ -621,7 +621,7 @@ module fpnew_fma #(
   // Classification after rounding
   assign uf_after_round = (rounded_abs[EXP_BITS+MAN_BITS-1:MAN_BITS] == '0) // denormal
         || ((pre_round_abs[EXP_BITS+MAN_BITS-1:MAN_BITS] == '0) && (rounded_abs[EXP_BITS+MAN_BITS-1:MAN_BITS] == 1) && 
-           ((round_sticky_bits != 2'b11) || (!sum_sticky_bits[MAN_BITS*2 + 4] && ((rnd_mode_i == fpnew_pkg::RNE) || (rnd_mode_i == fpnew_pkg::RMM)))));
+           ((round_sticky_bits != 2'b11) || (!sum_sticky_bits[MAN_BITS*2 + 4] && ((rnd_mode_q == fpnew_pkg::RNE) || (rnd_mode_q == fpnew_pkg::RMM)))));
   assign of_after_round = rounded_abs[EXP_BITS+MAN_BITS-1:MAN_BITS] == '1; // exponent all ones
 
   // -----------------

diff --git a/src/fpnew_fma_multi.sv b/src/fpnew_fma_multi.sv
@@ -799,7 +799,7 @@ module fpnew_fma_multi #(
         // detect of / uf        
         fmt_uf_after_round[fmt] = (rounded_abs[EXP_BITS+MAN_BITS-1:MAN_BITS] == '0) // denormal
         || ((pre_round_abs[EXP_BITS+MAN_BITS-1:MAN_BITS] == '0) && (rounded_abs[EXP_BITS+MAN_BITS-1:MAN_BITS] == 1) && 
-              ((round_sticky_bits != 2'b11) || (!sum_sticky_bits[MAN_BITS*2 + 4] && ((rnd_mode_i == fpnew_pkg::RNE) || (rnd_mode_i == fpnew_pkg::RMM)))));
+              ((round_sticky_bits != 2'b11) || (!sum_sticky_bits[MAN_BITS*2 + 4] && ((rnd_mode_q == fpnew_pkg::RNE) || (rnd_mode_q == fpnew_pkg::RMM)))));
         fmt_of_after_round[fmt] = rounded_abs[EXP_BITS+MAN_BITS-1:MAN_BITS] == '1; // inf exp.
 
         // Assemble regular result, nan box short ones.