Bugfix in peepopt_shiftmul.pmg

Signed-off-by: Clifford Wolf <clifford@clifford.at>

diff --git a/passes/pmgen/peepopt_shiftmul.pmg b/passes/pmgen/peepopt_shiftmul.pmg
index 1f9b3c2b94c594cc313d710250737471e3b54e7f..fe861b728301d0786a5acca528ebdde562d1192f 100644 (file)
--- a/passes/pmgen/peepopt_shiftmul.pmg
+++ b/passes/pmgen/peepopt_shiftmul.pmg
@@ -8,9 +8,13 @@ endmatch
 
 code shamt
        shamt = port(shift, \B);
+       if (shamt.empty())
+               reject;
        if (shamt[GetSize(shamt)-1] == State::S0) {
                do {
                        shamt.remove(GetSize(shamt)-1);
+                       if (shamt.empty())
+                               reject;
                } while (shamt[GetSize(shamt)-1] == State::S0);
        } else
        if (shift->type.in($shift, $shiftx) && param(shift, \B_SIGNED).as_bool()) {