-Olocaltemps -> -Olocal-temps for consistency; added manpage entry; removed leftover manpage entry for -foverlap-locals; -Olocal-temps moved from -O1 to -O3 due to stability concerns

doc/gmqcc.1

@@ -244,10 +244,6 @@ token inside the enclosing attribute-brackets. This may change when
 the actual attribute syntax is better defined.
 .SH COMPILE FLAGS
 .TP
-.B -foverlap-locals
-Allow local variables to overlap with each other if they don't
-interfer with each other. (Not implemented right now)
-.TP
 .B -fdarkplaces-string-table-bug
 Add some additional characters to the string table in order to
 compensate for a wrong boundcheck in some specific version of the
@@ -358,6 +354,14 @@ as long as the functions cannot be called in a recursive manner. Since
 it's hard to know whether or not an array is actually fully
 initialized, especially when initializing it via a loop, we assume
 functions with arrays to be too dangerous for this optimization.
+.TP
+.B -Olocal-temps
+This promotes locally declared variables to "temps". Meaning when a
+temporary result of an operation has to be stored somewhere, a local
+variable which is not 'alive' at that point can be used to keep the
+result. This can reduce the size of the global section.
+This will not have declared variables overlap, even if it was
+possible.
 .SH CONFIG
 The configuration file is similar to regular .ini files. Comments
 start with hashtags or semicolons, sections are written in square

ir.c

@@ -2127,7 +2127,7 @@ bool ir_function_allocate_locals(ir_function *self)
 
     for (i = 0; i < vec_size(self->locals); ++i)
     {
-        if (!OPTS_OPTIMIZATION(OPTIM_LOCALTEMPS))
+        if (!OPTS_OPTIMIZATION(OPTIM_LOCAL_TEMPS))
             self->locals[i]->unique_life = true;
         if (!function_allocator_alloc(&alloc, self->locals[i]))
             goto error;

opts.def

@@ -79,7 +79,7 @@
 
 #ifdef GMQCC_TYPE_OPTIMIZATIONS
     GMQCC_DEFINE_FLAG(PEEPHOLE,       1)
-    GMQCC_DEFINE_FLAG(LOCALTEMPS,     1)
+    GMQCC_DEFINE_FLAG(LOCAL_TEMPS,    3)
     GMQCC_DEFINE_FLAG(TAIL_RECURSION, 1)
     GMQCC_DEFINE_FLAG(TAIL_CALLS,     2)
     GMQCC_DEFINE_FLAG(OVERLAP_LOCALS, 3)