Dear users of the z80 backend, I intend to remove some z80 peephole rules. You might want to check if you are affected (by compiling your source usign current SDCC 3.6.9 #10025 or later with --fverbose-asm, and checking the output, e.g. using a command like "grep peephole 21c test.asm".
While peephole rules are a quick way to get a bit of optimization, often improvements in code generation and register allocation can result in even better code (and also make old peephole rules obsolete). None of these rules is currently used in the regression tests for z80. Keeping unused and untested rules comes with a maintainance burden and a risk for bugs, so rules that are no longer used should be removed once in a while. If one of the rules that I want to remove happens to be used by SDCC when compiling your code, please report on the list, and I well keep it. Ideally, you would also provide a small some compileable source example that SDCC uses the rule for. Here is the list of rules to be removed: 5 14 21 21a 21c 30 38 39 49f 49g 51b 51c 51d 51ethen 58 59 66 71 73 74 84 85 91 92 97 105 108 109 110 111a 111c 118 119If y 120 121 122 122a 123 126 128 129 130 131 132 140 141a 146 Philipp ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
