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Try to generate more predicable code. clc always before adc or sbc.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@4056 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2009-08-27 16:59:26 +00:00
parent 1b4e2111c3
commit 55e8f67640
1 changed files with 9 additions and 4 deletions
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11
src/cc65/codegen.c
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@ -3235,16 +3235,21 @@ void g_inc (unsigned flags, unsigned long val)
if (val >= 0x300) { if (val >= 0x300) {
AddCodeLine ("inx"); AddCodeLine ("inx");
} }
} else { } else if ((val & 0xFF) != 0) {
AddCodeLine ("clc"); AddCodeLine ("clc");
if ((val & 0xFF) != 0) {
AddCodeLine ("adc #$%02X", (unsigned char) val); AddCodeLine ("adc #$%02X", (unsigned char) val);
}
AddCodeLine ("pha"); AddCodeLine ("pha");
AddCodeLine ("txa"); AddCodeLine ("txa");
AddCodeLine ("adc #$%02X", (unsigned char) (val >> 8)); AddCodeLine ("adc #$%02X", (unsigned char) (val >> 8));
AddCodeLine ("tax"); AddCodeLine ("tax");
AddCodeLine ("pla"); AddCodeLine ("pla");
} else {
AddCodeLine ("pha");
AddCodeLine ("txa");
AddCodeLine ("clc");
AddCodeLine ("adc #$%02X", (unsigned char) (val >> 8));
AddCodeLine ("tax");
AddCodeLine ("pla");
} }
} }
break; break;