Inc of a local is optimized out

[dplassgit]

g:proc(arg: int): int {
  local = arg
  local++
  return local
}
print "Should be 4: " println g(3)

This fails.

Log:

$ ./scripts/dccrun test/bootstrap/v3/incdec.d --debugopt=2
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.ConstantPropagationOptimizer visit
INFO: Possible replacement of StackLocation local = arg
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.ConstantPropagationOptimizer lambda$visit$0
INFO: REPLACING ip 5: return local: INT (4) with return arg
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.ConstantPropagationOptimizer visit
INFO: Possible replacement of TempLocation __temp2 = "Should be 4: "
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.ConstantPropagationOptimizer deleteSource
INFO: REPLACING ip 8: __temp2 = \"Should be 4: \" with // nop was: __temp2 = \"Should be 4: \"
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.ConstantPropagationOptimizer visit
INFO: REPLACING ip 9: printf("%s", __temp2) with printf("%s", \"Should be 4: \")
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.ConstantPropagationOptimizer visit
INFO: Possible replacement of TempLocation __temp3 = 3
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.ConstantPropagationOptimizer deleteSource
INFO: REPLACING ip 10: __temp3 = 3 with // nop was: __temp3 = 3
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.ConstantPropagationOptimizer visit
INFO: REPLACING ip 11: __temp4 = g(__temp3) with __temp4 = g(3)

ConstantPropagationOptimizer OPTIMIZED:
goto __after_proc_g_1
_g:
g(arg: INT) {
local: INT (4) = arg
local: INT (4)++
return arg
end g
__after_proc_g_1:
// nop was: __temp2 = \"Should be 4: \"
printf("%s", \"Should be 4: \")
// nop was: __temp3 = 3
__temp4 = g(3)
printf("%s\n", __temp4)
exit(0)
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.DeadAssignmentOptimizer visit
INFO: Killing all unused variables at end of proc: {local: INT (4)=4}
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.DeadAssignmentOptimizer visit
INFO: REPLACING ip 4: local: INT (4)++ with // nop was: local: INT (4)++

DeadAssignmentOptimizer OPTIMIZED:
goto __after_proc_g_1
_g:
g(arg: INT) {
local: INT (4) = arg
// nop was: local: INT (4)++
return arg
end g
__after_proc_g_1:
// nop was: __temp2 = \"Should be 4: \"
printf("%s", \"Should be 4: \")
// nop was: __temp3 = 3
__temp4 = g(3)
printf("%s\n", __temp4)
exit(0)
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.LoopInvariantOptimizer optimize
INFO: Loops: []

NopOptimizer OPTIMIZED:
goto __after_proc_g_1
_g:
g(arg: INT) {
local: INT (4) = arg
return arg
end g
__after_proc_g_1:
printf("%s", \"Should be 4: \")
__temp4 = g(3)
printf("%s\n", __temp4)
exit(0)
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.ConstantPropagationOptimizer visit
INFO: Possible replacement of StackLocation local = arg
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.DeadAssignmentOptimizer visit
INFO: Killing all unused variables at end of proc: {local: INT (4)=3}
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.DeadAssignmentOptimizer visit
INFO: REPLACING ip 3: local: INT (4) = arg with // nop was: local: INT (4) = arg

DeadAssignmentOptimizer OPTIMIZED:
goto __after_proc_g_1
_g:
g(arg: INT) {
// nop was: local: INT (4) = arg
return arg
end g
__after_proc_g_1:
printf("%s", \"Should be 4: \")
__temp4 = g(3)
printf("%s\n", __temp4)
exit(0)
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.LoopInvariantOptimizer optimize
INFO: Loops: []

NopOptimizer OPTIMIZED:
goto __after_proc_g_1
_g:
g(arg: INT) {
return arg
end g
__after_proc_g_1:
printf("%s", \"Should be 4: \")
__temp4 = g(3)
printf("%s\n", __temp4)
exit(0)
Jun 09, 2023 10:02:56 PM com.plasstech.lang.d2.optimize.LoopInvariantOptimizer optimize
INFO: Loops: []

ITERATIONS: 5

OPTIMIZED:
goto __after_proc_g_1
_g:
g(arg: INT) {
return arg
end g
__after_proc_g_1:
printf("%s", \"Should be 4: \")
__temp4 = g(3)
printf("%s\n", __temp4)
exit(0)

Should be 4: 3

[dplassgit]

Looks like issue with ConstantPropagationOptimizer not considering inc or dec as an assignment.