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proc_mux: Fix crash when trying to optimize non-existant mux to shiftx 

last_mux_cell can be NULL ...

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
This commit is contained in:
Sylvain Munaut 2019-04-03 14:50:12 +02:00
parent 721fa1cbd8
commit 39380c45ba
1 changed files with 1 additions and 1 deletions
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2
passes/proc/proc_mux.cc
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@ -361,7 +361,7 @@ RTLIL::SigSpec signal_to_mux_tree(RTLIL::Module *mod, SnippetSwCache &swcache, d
}
// Transform into a $shiftx where possible
if (shiftx && last_mux_cell->type == "$pmux") {
if (shiftx && last_mux_cell && last_mux_cell->type == "$pmux") {
// Create bit-blasted $shiftx-es that shifts by the address line used in the case statement
auto pmux_b_port = last_mux_cell->getPort("\\B");
auto pmux_y_port = last_mux_cell->getPort("\\Y");