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Fixed the cc65 code that optimizes 16-bit compares when the high bytes are known to be equal.

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Only the low bytes are compared.  Originally, signed 16-bit compares were optimized into signed 8-bit compares.  But, the sign bits are in the high bytes; and, they're equal.  Therefore, the low bytes always must be compared as unsigned numbers.
Fixes #1348.
This commit is contained in:
Greg King
2020-12-24 12:27:09 -05:00
parent 0f4cb443b4
commit b2c1a77bb3
3 changed files with 37 additions and 77 deletions
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8
test/misc/Makefile
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@@ -117,14 +117,6 @@ $(WORKDIR)/endless.$1.$2.prg: endless.c | $(WORKDIR)
$(LD65) -t sim$2 -o $$@ $$(@:.prg=.o) sim$2.lib $(NULLERR)
$(NOT) $(SIM65) $(SIM65FLAGS) $$@ $(NULLOUT) $(NULLERR)
# this one fails when optimization are enabled
$(WORKDIR)/bug1348.$1.$2.prg: bug1348.c | $(WORKDIR)
$(if $(QUIET),echo misc/bug1348.$1.$2.prg)
$(CC65) -Osr -t sim$2 -$1 -o $$(@:.prg=.s) $$< $(NULLERR)
$(CA65) -t sim$2 -o $$(@:.prg=.o) $$(@:.prg=.s) $(NULLERR)
$(LD65) -t sim$2 -o $$@ $$(@:.prg=.o) sim$2.lib $(NULLERR)
$(NOT) $(SIM65) $(SIM65FLAGS) $$@ $(NULLOUT) $(NULLERR)
# these need reference data that can't be generated by a host-compiled program,
# in a useful way
$(WORKDIR)/limits.$1.$2.prg: limits.c $(ISEQUAL) | $(WORKDIR)