Remove CC0

This removes CC0 and all directly related infrastructure.

CC_STATUS, CC_STATUS_MDEP, CC_STATUS_MDEP_INIT, and NOTICE_UPDATE_CC
are deleted and poisoned.  CC0 is only deleted (some targets use that
name for something else).  HAVE_cc0 is automatically generated, and we
no longer will do that after this patch.

CC_STATUS_INIT is suggested in final.c to also be useful for ports that
are not CC0, and at least arm seems to use it for something.  So I am
leaving that alone, but most targets that have it could remove it.

2021-05-04  Segher Boessenkool  <segher@kernel.crashing.org>

	* caller-save.c: Remove CC0.
	* cfgcleanup.c: Remove CC0.
	* cfgrtl.c: Remove CC0.
	* combine.c: Remove CC0.
	* compare-elim.c: Remove CC0.
	* conditions.h: Remove CC0.
	* config/h8300/h8300.h: Remove CC0.
	* config/h8300/h8300-protos.h: Remove CC0.
	* config/h8300/peepholes.md: Remove CC0.
	* config/i386/x86-tune-sched.c: Remove CC0.
	* config/m68k/m68k.c: Remove CC0.
	* config/rl78/rl78.c: Remove CC0.
	* config/sparc/sparc.c: Remove CC0.
	* config/xtensa/xtensa.c: Remove CC0.
	(gen_conditional_move):  Use pc_rtx instead of cc0_rtx in a piece of
	RTL where that is used as a placeholder only.
	* cprop.c: Remove CC0.
	* cse.c: Remove CC0.
	* cselib.c: Remove CC0.
	* df-problems.c: Remove CC0.
	* df-scan.c: Remove CC0.
	* doc/md.texi: Remove CC0.  Adjust an example.
	* doc/rtl.texi: Remove CC0.  Adjust an example.
	* doc/tm.texi: Regenerate.
	* doc/tm.texi.in: Remove CC0.
	* emit-rtl.c: Remove CC0.
	* final.c: Remove CC0.
	* fwprop.c: Remove CC0.
	* gcse-common.c: Remove CC0.
	* gcse.c: Remove CC0.
	* genattrtab.c: Remove CC0.
	* genconfig.c: Remove CC0.
	* genemit.c: Remove CC0.
	* genextract.c: Remove CC0.
	* gengenrtl.c: Remove CC0.
	* genrecog.c: Remove CC0.
	* haifa-sched.c: Remove CC0.
	* ifcvt.c: Remove CC0.
	* ira-costs.c: Remove CC0.
	* ira.c: Remove CC0.
	* jump.c: Remove CC0.
	* loop-invariant.c: Remove CC0.
	* lra-constraints.c: Remove CC0.
	* lra-eliminations.c: Remove CC0.
	* optabs.c: Remove CC0.
	* postreload-gcse.c: Remove CC0.
	* postreload.c: Remove CC0.
	* print-rtl.c: Remove CC0.
	* read-rtl-function.c: Remove CC0.
	* reg-notes.def: Remove CC0.
	* reg-stack.c: Remove CC0.
	* reginfo.c: Remove CC0.
	* regrename.c: Remove CC0.
	* reload.c: Remove CC0.
	* reload1.c: Remove CC0.
	* reorg.c: Remove CC0.
	* resource.c: Remove CC0.
	* rtl.c: Remove CC0.
	* rtl.def: Remove CC0.
	* rtl.h: Remove CC0.
	* rtlanal.c: Remove CC0.
	* sched-deps.c: Remove CC0.
	* sched-rgn.c: Remove CC0.
	* shrink-wrap.c: Remove CC0.
	* simplify-rtx.c: Remove CC0.
	* system.h: Remove CC0.  Poison NOTICE_UPDATE_CC, CC_STATUS_MDEP_INIT,
	CC_STATUS_MDEP, and CC_STATUS.
	* target.def: Remove CC0.
	* valtrack.c: Remove CC0.
	* var-tracking.c: Remove CC0.

1 files changed, 0 insertions, 49 deletions

diff --git a/gcc/conditions.h b/gcc/conditions.h
index a4d17ca..d9ca51a 100644
--- a/gcc/conditions.h
+++ b/gcc/conditions.h
@@ -20,46 +20,6 @@ along with GCC; see the file COPYING3.  If not see
 #ifndef GCC_CONDITIONS_H
 #define GCC_CONDITIONS_H
 
-/* The variable cc_status says how to interpret the condition code.
-   It is set by output routines for an instruction that sets the cc's
-   and examined by output routines for jump instructions.
-
-   cc_status contains two components named `value1' and `value2'
-   that record two equivalent expressions for the values that the
-   condition codes were set from.  (Either or both may be null if
-   there is no useful expression to record.)  These fields are
-   used for eliminating redundant test and compare instructions
-   in the cases where the condition codes were already set by the
-   previous instruction.
-
-   cc_status.flags contains flags which say that the condition codes
-   were set in a nonstandard manner.  The output of jump instructions
-   uses these flags to compensate and produce the standard result
-   with the nonstandard condition codes.  Standard flags are defined here.
-   The tm.h file can also define other machine-dependent flags.
-
-   cc_status also contains a machine-dependent component `mdep'
-   whose type, `CC_STATUS_MDEP', may be defined as a macro in the
-   tm.h file.  */
-
-#ifndef CC_STATUS_MDEP
-#define CC_STATUS_MDEP int
-#endif
-
-#ifndef CC_STATUS_MDEP_INIT
-#define CC_STATUS_MDEP_INIT 0
-#endif
-
-struct CC_STATUS {int flags; rtx value1, value2; CC_STATUS_MDEP mdep;};
-
-/* While outputting an insn as assembler code,
-   this is the status BEFORE that insn.  */
-extern CC_STATUS cc_prev_status;
-
-/* While outputting an insn as assembler code,
-   this is being altered to the status AFTER that insn.  */
-extern CC_STATUS cc_status;
-
 /* These are the machine-independent flags:  */
 
 /* Set if the sign of the cc value is inverted:
@@ -106,13 +66,4 @@ extern CC_STATUS cc_status;
    This is only used by machine description files.  */
 #define CC_NOT_SIGNED 0200
 
-/* This is how to initialize the variable cc_status.
-   final does this at appropriate moments.  */
-
-/* FIXME: We want to get rid of these ifndefs.  */
-#ifndef CC_STATUS_INIT
-#define CC_STATUS_INIT  \
- (cc_status.flags = 0, cc_status.value1 = 0, cc_status.value2 = 0,  \
-  CC_STATUS_MDEP_INIT)
-#endif
 #endif /* GCC_CONDITIONS_H */