http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51364
--- Comment #10 from Domingo Alvarez <mingodad at gmail dot com> 2011-12-19 02:25:16 UTC --- Created attachment 26131 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26131 Program to show that gcc doesn't generate good code size Here is a program and a batch file that call gcc to generate executables with different features to show that gcc doesn't generate good code size when it probably can with _Decimal*. There is two source files main.c and printf.c the smallest executable is generated with main.c alone, the biggest executable is generated with main.c and printf.c using _Decimal128 mixed with _Decimal128 and using isnan. gcc -O2 main.c -o smallest.exe -> 175KB gcc -O2 -DWITH_DEC128 -DWITH_ISNAN -DWITH_MPRINTF main.c printf.c -o biggest.exe -> 2.606KB gcc -O2 -DWITH_MPRINTF main.c printf.c -o optimus.exe -> 279KB gcc -O2 -DWITH_DEC128 -DWITH_MPRINTF main.c printf.c -o good.exe -> 503KB They make several mixes to show how gcc is generating code sizes to basically the same use of features. My hope is that this will help analyze and find why this happen. The answers to this till now don't seem to be valid/consistent.
