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Try to generate more predictable code.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@4013 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz
2009-08-15 13:25:40 +00:00
parent fbe009a182
commit 3717443f3b
1 changed files with 19 additions and 10 deletions
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27
src/cc65/codegen.c
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@@ -1885,8 +1885,8 @@ void g_subeqstatic (unsigned flags, unsigned long label, long offs,
AddCodeLine ("dec %s", lbuf); AddCodeLine ("dec %s", lbuf);
AddCodeLine ("lda %s", lbuf); AddCodeLine ("lda %s", lbuf);
} else { } else {
AddCodeLine ("sec");
AddCodeLine ("lda %s", lbuf); AddCodeLine ("lda %s", lbuf);
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (int)(val & 0xFF)); AddCodeLine ("sbc #$%02X", (int)(val & 0xFF));
AddCodeLine ("sta %s", lbuf); AddCodeLine ("sta %s", lbuf);
} }
@@ -1907,9 +1907,9 @@ void g_subeqstatic (unsigned flags, unsigned long label, long offs,
/* FALLTHROUGH */ /* FALLTHROUGH */
case CF_INT: case CF_INT:
AddCodeLine ("sec");
if (flags & CF_CONST) { if (flags & CF_CONST) {
AddCodeLine ("lda %s", lbuf); AddCodeLine ("lda %s", lbuf);
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char)val); AddCodeLine ("sbc #$%02X", (unsigned char)val);
AddCodeLine ("sta %s", lbuf); AddCodeLine ("sta %s", lbuf);
if (val < 0x100) { if (val < 0x100) {
@@ -1927,6 +1927,7 @@ void g_subeqstatic (unsigned flags, unsigned long label, long offs,
} }
} else { } else {
AddCodeLine ("eor #$FF"); AddCodeLine ("eor #$FF");
AddCodeLine ("sec");
AddCodeLine ("adc %s", lbuf); AddCodeLine ("adc %s", lbuf);
AddCodeLine ("sta %s", lbuf); AddCodeLine ("sta %s", lbuf);
AddCodeLine ("txa"); AddCodeLine ("txa");
@@ -1980,12 +1981,13 @@ void g_subeqlocal (unsigned flags, int offs, unsigned long val)
if (flags & CF_FORCECHAR) { if (flags & CF_FORCECHAR) {
ldyconst (offs); ldyconst (offs);
AddCodeLine ("ldx #$00"); AddCodeLine ("ldx #$00");
AddCodeLine ("sec");
if (flags & CF_CONST) { if (flags & CF_CONST) {
AddCodeLine ("lda (sp),y"); AddCodeLine ("lda (sp),y");
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char)val); AddCodeLine ("sbc #$%02X", (unsigned char)val);
} else { } else {
AddCodeLine ("eor #$FF"); AddCodeLine ("eor #$FF");
AddCodeLine ("sec");
AddCodeLine ("adc (sp),y"); AddCodeLine ("adc (sp),y");
} }
AddCodeLine ("sta (sp),y"); AddCodeLine ("sta (sp),y");
@@ -3314,15 +3316,22 @@ void g_dec (unsigned flags, unsigned long val)
AddCodeLine ("dex"); AddCodeLine ("dex");
} }
} else { } else {
AddCodeLine ("sec");
if ((val & 0xFF) != 0) { if ((val & 0xFF) != 0) {
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char) val); AddCodeLine ("sbc #$%02X", (unsigned char) val);
AddCodeLine ("pha");
AddCodeLine ("txa");
AddCodeLine ("sbc #$%02X", (unsigned char) (val >> 8));
AddCodeLine ("tax");
AddCodeLine ("pla");
} else {
AddCodeLine ("pha");
AddCodeLine ("txa");
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char) (val >> 8));
AddCodeLine ("tax");
AddCodeLine ("pla");
} }
AddCodeLine ("pha");
AddCodeLine ("txa");
AddCodeLine ("sbc #$%02X", (unsigned char) (val >> 8));
AddCodeLine ("tax");
AddCodeLine ("pla");
} }
} }
break; break;