fsgnjn.s
Single-precision sign inject negate
This instruction is defined by:
Synopsis
Writes fd with the opposite of the sign bit of fs2 and the exponent and mantissa of fs1.
Sign-injection instructions do not set floating-point exception flags, nor do they canonicalize NaNs.
Decode Variables
Bits<5> fs2 = $encoding[24:20];
Bits<5> fs1 = $encoding[19:15];
Bits<5> fd = $encoding[11:7];Execution
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Pruned, XLEN == 64
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Original
check_f_ok($encoding);
Bits<32> sp_value = {~f[fs2][31], f[fs1][30:0]};
f[fd] = nan_box<32, 64>(sp_value);
mark_f_state_dirty();check_f_ok($encoding);
Bits<32> sp_value = {~f[fs2][31], f[fs1][30:0]};
if (implemented?(ExtensionName::D)) {
f[fd] = nan_box<32, 64>(sp_value);
} else {
f[fd] = sp_value;
}
mark_f_state_dirty();