> Did you did any archeology into this code to see if there was any
> history that might shed light on why it doesn't just using the costing
> models?
This one was buried under some dust :)
commit 0254c56158b0533600ba9036258c11d377d46adf
Author: John Carr <j...@mit.edu>
Date: Wed Jun 10 06:00:50 1998 +0000
reload1.c (reload_cse_simplify_operands): Do not call gen_rtx_REG
for each alternative.
Wed Jun 10 08:56:27 1998 John Carr <j...@mit.edu>
* reload1.c (reload_cse_simplify_operands): Do not call
gen_rtx_REG
for each alternative. Do not replace a CONST_INT with a REG
unless
the reg is cheaper.
From-SVN: r20402
Back then we didn't have vectors I suppose but apart from that I don't
see a compelling reason not to unconditionally check costs from this.
It seems like we did even more unconditional replacing before it,
including CONST_INTs.
Regards
Robin
