avr.md: Document UNSPEC usage.
* config/avr/avr.md: Document UNSPEC usage. (*tablejump_rjmp, *tablejump_lib, *tablejump_enh, *tablejump): Make operand 0 input only, clobber it. Use UNSPEC, not a bogus MEM for program memory word reference. Do not add the label to the table index in each of the asm output templates, instead ... (casesi): ... do it in RTL. Adjust to match the above change. From-SVN: r37951
This commit is contained in:
Marek Michalkiewicz
Denis Chertykov
parent
0884b60c60
commit
84e6f1ba38
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@ -1,3 +1,12 @@
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2000-11-23 Marek Michalkiewicz <marekm@linux.org.pl>
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* config/avr/avr.md: Document UNSPEC usage.
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(*tablejump_rjmp, *tablejump_lib, *tablejump_enh, *tablejump):
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Make operand 0 input only, clobber it. Use UNSPEC, not a bogus
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MEM for program memory word reference. Do not add the label to
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the table index in each of the asm output templates, instead ...
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(casesi): ... do it in RTL. Adjust to match the above change.
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2000-12-02 Bernd Schmidt <bernds@redhat.co.uk>
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* c-common.c (PTRDIFF_TYPE): Provide default here, ...
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@ -21,6 +21,10 @@
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;; the Free Software Foundation, 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;; UNSPEC usage:
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;; 0 Length of a string, see "strlenhi".
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;; 1 Read from a word address in program memory, see "casesi".
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;; Condition code settings.
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(define_attr "cc" "none,set_czn,set_zn,set_n,compare,clobber"
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(const_string "none"))
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@ -1850,61 +1854,48 @@
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;; table jump
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;; Note: the (mem:HI (...)) memory references here are special - actually
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;; the data is read from a word address in program memory (r31:r30 is the
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;; index in the table, not multiplied by 2 - see the "casesi" pattern).
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;; Table made from "rjmp" instructions for <=8K devices.
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(define_insn "*tablejump_rjmp"
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[(set (pc) (mem:HI
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(plus:HI (match_operand:HI 0 "register_operand" "=&z")
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(label_ref (match_operand 2 "" "")))))
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(use (label_ref (match_operand 1 "" "")))]
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[(set (pc) (unspec:HI [(match_operand:HI 0 "register_operand" "!z,*r")] 1))
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(use (label_ref (match_operand 1 "" "")))
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(clobber (match_dup 0))]
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"!AVR_MEGA"
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"subi r30,pm_lo8(-(%2))
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sbci r31,pm_hi8(-(%2))
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ijmp"
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[(set_attr "length" "3")
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(set_attr "cc" "clobber")])
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"@
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ijmp
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push %A0\;push %B0\;ret"
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[(set_attr "length" "1,3")
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(set_attr "cc" "none,none")])
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;; Not a prologue, but similar idea - move the common piece of code to libgcc.
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(define_insn "*tablejump_lib"
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[(set (pc) (mem:HI (plus:HI (match_operand:HI 0 "register_operand" "=&z")
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(label_ref (match_operand 2 "" "")))))
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(use (label_ref (match_operand 1 "" "")))]
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[(set (pc) (unspec:HI [(match_operand:HI 0 "register_operand" "z")] 1))
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(use (label_ref (match_operand 1 "" "")))
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(clobber (match_dup 0))]
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"AVR_MEGA && TARGET_CALL_PROLOGUES"
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"subi r30,pm_lo8(-(%2))
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sbci r31,pm_hi8(-(%2))
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jmp __tablejump2__"
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[(set_attr "length" "4")
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"jmp __tablejump2__"
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[(set_attr "length" "2")
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(set_attr "cc" "clobber")])
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(define_insn "*tablejump_enh"
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[(set (pc) (mem:HI
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(plus:HI (match_operand:HI 0 "register_operand" "=&z")
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(label_ref (match_operand 2 "" "")))))
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(use (label_ref (match_operand 1 "" "")))]
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[(set (pc) (unspec:HI [(match_operand:HI 0 "register_operand" "z")] 1))
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(use (label_ref (match_operand 1 "" "")))
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(clobber (match_dup 0))]
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"AVR_MEGA && AVR_ENHANCED"
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"subi r30,pm_lo8(-(%2))
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sbci r31,pm_hi8(-(%2))
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lsl r30
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"lsl r30
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rol r31
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lpm __tmp_reg__,Z+
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lpm r31,Z
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mov r30,__tmp_reg__
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ijmp"
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[(set_attr "length" "8")
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[(set_attr "length" "6")
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(set_attr "cc" "clobber")])
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(define_insn "*tablejump"
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[(set (pc) (mem:HI
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(plus:HI (match_operand:HI 0 "register_operand" "=&z")
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(label_ref (match_operand 2 "" "")))))
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(use (label_ref (match_operand 1 "" "")))]
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[(set (pc) (unspec:HI [(match_operand:HI 0 "register_operand" "z")] 1))
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(use (label_ref (match_operand 1 "" "")))
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(clobber (match_dup 0))]
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"AVR_MEGA"
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"subi r30,pm_lo8(-(%2))
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sbci r31,pm_hi8(-(%2))
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lsl r30
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"lsl r30
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rol r31
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lpm
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inc r30
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@ -1912,7 +1903,7 @@
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lpm
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push r0
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ret"
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[(set_attr "length" "10")
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[(set_attr "length" "8")
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(set_attr "cc" "clobber")])
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(define_expand "casesi"
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@ -1929,16 +1920,13 @@
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(const_int 0))
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(label_ref (match_operand 4 "" ""))
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(pc)))
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;; (set (match_dup 6)
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;; (plus:HI (match_dup 6)
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;; (match_dup 6)))
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;; (set (match_dup 6)
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;; (plus:HI (match_dup 6) (label_ref (match_operand:HI 3 "" ""))))
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(parallel [(set (pc) (mem:HI
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(plus:HI (match_dup 6)
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(label_ref (match_operand:HI 3 "" "")))))
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(use (label_ref (match_dup 3)))])]
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(set (match_dup 6)
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(plus:HI (match_dup 6) (label_ref (match_operand:HI 3 "" ""))))
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(parallel [(set (pc) (unspec:HI [(match_dup 6)] 1))
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(use (label_ref (match_dup 3)))
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(clobber (match_dup 6))])]
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""
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"
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{
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