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Fix code generation error in gcc6809
It turned out that under some circumstances, the gcc optimizer would select
an instruction sequence that had the sense of a branch inverted. It seems
this was due to a particular instruction pattern included in the machine
description not being quite right with respect to how the condition codes
were tracked. Removing that instruction pattern seems to fix things
(subtraction with the arguments reversed). gcc seems to be smart enough to
figure out how to reorganize code to work without this reversed sense
subtraction and then do the right thing.
author | William Astle <lost@l-w.ca> |
---|---|
date | Thu, 24 Mar 2016 20:07:20 -0600 |
parents | 35d4213e6657 |
children | a6c9129e5948 |
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# define anything system specific here # # set these variables if needed # PROGSUFFIX: suffix added to binaries # BUILDTPREFIX: prefix added to build utilities (cc, etc.) for xcompile # can also set them when invoking "make" #PROGSUFFIX := .exe #BUILDTPREFIX=i586-mingw32msvc- ifneq ($(DESTDIR),) INSTALLDIR = $(DESTDIR)/usr/bin else INSTALLDIR ?= /usr/local/bin endif # this are probably pointless but they will make sure # the variables are set without overriding the environment # or automatic values from make itself. CC ?= cc AR ?= ar RANLIB ?= ranlib # Set variables for cross compiling ifneq ($(BUILDTPREFIX),) CC := $(BUILDTPREFIX)$(CC) AR := $(BUILDTPREFIX)$(AR) RANLIB := $(BUILDTPREFIX)$(RANLIB) endif CPPFLAGS += -I lwlib LDFLAGS += -Llwlib -llw CFLAGS ?= -O3 -Wall -Wno-char-subscripts MAIN_TARGETS := lwasm/lwasm$(PROGSUFFIX) \ lwlink/lwlink$(PROGSUFFIX) \ lwar/lwar$(PROGSUFFIX) \ lwlink/lwobjdump$(PROGSUFFIX) .PHONY: all all: $(MAIN_TARGETS) lwar_srcs := add.c extract.c list.c lwar.c main.c remove.c replace.c lwar_srcs := $(addprefix lwar/,$(lwar_srcs)) lwlib_srcs := lw_alloc.c lw_realloc.c lw_free.c lw_error.c lw_expr.c \ lw_stack.c lw_string.c lw_stringlist.c lw_cmdline.c lwlib_srcs := $(addprefix lwlib/,$(lwlib_srcs)) lwlink_srcs := main.c lwlink.c readfiles.c expr.c script.c link.c output.c map.c lwobjdump_srcs := objdump.c lwlink_srcs := $(addprefix lwlink/,$(lwlink_srcs)) lwobjdump_srcs := $(addprefix lwlink/,$(lwobjdump_srcs)) lwasm_srcs := cycle.c debug.c input.c insn_bitbit.c insn_gen.c insn_indexed.c \ insn_inh.c insn_logicmem.c insn_rel.c insn_rlist.c insn_rtor.c insn_tfm.c \ instab.c list.c lwasm.c macro.c main.c os9.c output.c pass1.c pass2.c \ pass3.c pass4.c pass5.c pass6.c pass7.c pragma.c pseudo.c section.c \ struct.c symbol.c unicorns.c lwasm_srcs := $(addprefix lwasm/,$(lwasm_srcs)) lwasm_objs := $(lwasm_srcs:.c=.o) lwlink_objs := $(lwlink_srcs:.c=.o) lwar_objs := $(lwar_srcs:.c=.o) lwlib_objs := $(lwlib_srcs:.c=.o) lwobjdump_objs := $(lwobjdump_srcs:.c=.o) lwasm_deps := $(lwasm_srcs:.c=.d) lwlink_deps := $(lwlink_srcs:.c=.d) lwar_deps := $(lwar_srcs:.c=.d) lwlib_deps := $(lwlib_srcs:.c=.d) lwobjdump_deps := $(lwobjdump_srcs:.c=.d) .PHONY: lwlink lwasm lwar lwobjdump lwlink: lwlink/lwlink$(PROGSUFFIX) lwasm: lwasm/lwasm$(PROGSUFFIX) lwar: lwar/lwar$(PROGSUFFIX) lwobjdump: lwlink/lwobjdump$(PROGSUFFIX) lwasm/lwasm$(PROGSUFFIX): $(lwasm_objs) lwlib @echo Linking $@ @$(CC) -o $@ $(lwasm_objs) $(LDFLAGS) lwlink/lwlink$(PROGSUFFIX): $(lwlink_objs) lwlib @echo Linking $@ @$(CC) -o $@ $(lwlink_objs) $(LDFLAGS) lwlink/lwobjdump$(PROGSUFFIX): $(lwobjdump_objs) lwlib @echo Linking $@ @$(CC) -o $@ $(lwobjdump_objs) $(LDFLAGS) lwar/lwar$(PROGSUFFIX): $(lwar_objs) lwlib @echo Linking $@ @$(CC) -o $@ $(lwar_objs) $(LDFLAGS) #.PHONY: lwlib .INTERMEDIATE: lwlib lwlib: lwlib/liblw.a lwlib/liblw.a: $(lwlib_objs) @echo Linking $@ @$(AR) rc $@ $(lwlib_objs) @$(RANLIB) $@ alldeps := $(lwasm_deps) $(lwlink_deps) $(lwar_deps) $(lwlib_deps) ($lwobjdump_deps) -include $(alldeps) extra_clean := $(extra_clean) *~ */*~ %.o: %.c @echo "Building dependencies for $@" @$(CC) -MM $(CPPFLAGS) -o $*.d $< @mv -f $*.d $*.d.tmp @sed -e 's|.*:|$*.o $*.d:|' < $*.d.tmp > $*.d @sed -e 's/.*://' -e 's/\\$$//' < $*.d.tmp | fmt -1 | sed -e 's/^ *//' -e 's/$$/:/' >> $*.d @rm -f $*.d.tmp @echo Building $@ @$(CC) $(CPPFLAGS) $(CFLAGS) -o $@ -c $< .PHONY: clean clean: $(cleantargs) @echo "Cleaning up" @rm -f lwlib/liblw.a lwasm/lwasm$(PROGSUFFIX) lwlink/lwlink$(PROGSUFFIX) lwlink/lwobjdump$(PROGSUFFIX) lwar/lwar$(PROGSUFFIX) @rm -f $(lwasm_objs) $(lwlink_objs) $(lwar_objs) $(lwlib_objs) $(lwobjdump_objs) @rm -f $(extra_clean) @rm -f */*.exe .PHONY: realclean realclean: clean $(realcleantargs) @echo "Cleaning up even more" @rm -f $(lwasm_deps) $(lwlink_deps) $(lwar_deps) $(lwlib_deps) $(lwobjdump_deps) print-%: @echo $* = $($*) .PHONY: install install: install -d $(INSTALLDIR) install $(MAIN_TARGETS) $(INSTALLDIR) .PHONY: test test: all test/runtests @test/runtests