mirror/gcc
2
0
Fork 0
mirror of git://gcc.gnu.org/git/gcc.git synced 2025-04-19 13:10:50 +08:00
Code Issues Packages Projects Releases Wiki Activity

* config/pdp11/pdp11.md (lshrsi3, lshrhi3): Fix wrong code.

Browse Source 
From-SVN: r166468
This commit is contained in:
Paul Koning 2010-11-08 20:13:30 -05:00 committed by Paul Koning
parent 8860adf4b7
commit d5214afa12
2 changed files with 65 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
gcc/ChangeLog
View File

@ -1,3 +1,7 @@
2010-11-08 Paul Koning <ni1d@arrl.net>
* config/pdp11/pdp11.md (lshrsi3, lshrhi3): Fix wrong code.
2010-11-08 Paul Koning <ni1d@arrl.net>
* config/pdp11/pdp11.md (negsi2): Fix wrong code.

70
gcc/config/pdp11/pdp11.md
View File

@ -849,7 +849,7 @@
[(set_attr "length" "2,4")])
;; lsr
(define_insn ""
(define_insn "lsrhi1"
[(set (match_operand:HI 0 "nonimmediate_operand" "=rR,Q")
(lshiftrt:HI (match_operand:HI 1 "general_operand" "0,0")
(const_int 1)))]
@ -857,7 +857,7 @@
"clc\;ror %0"
[(set_attr "length" "2,4")])
(define_insn "lshrsi3"
(define_insn "lsrsi1"
[(set (match_operand:SI 0 "register_operand" "=r")
(lshiftrt:SI (match_operand:SI 1 "general_operand" "0")
(const_int 1)))]
@ -880,6 +880,36 @@
}
[(set_attr "length" "10")])
(define_expand "lshrsi3"
[(match_operand:SI 0 "register_operand" "")
(match_operand:SI 1 "register_operand" "0")
(match_operand:HI 2 "general_operand" "")]
""
"
{
rtx r;
if (!TARGET_40_PLUS &&
(GET_CODE (operands[2]) != CONST_INT ||
(unsigned) INTVAL (operands[2]) > 3))
FAIL;
emit_insn (gen_lsrsi1 (operands[0], operands[1]));
if (GET_CODE (operands[2]) != CONST_INT)
{
r = gen_reg_rtx (HImode);
emit_insn (gen_subhi3 (r, operands [2], GEN_INT (1)));
emit_insn (gen_ashrsi3 (operands[0], operands[0], r));
}
else if ((unsigned) INTVAL (operands[2]) != 1)
{
emit_insn (gen_ashlsi3 (operands[0], operands[0],
GEN_INT (1 - INTVAL (operands[2]))));
}
DONE;
}
"
)
;; shift is by arbitrary count is expensive,
;; shift by one cheap - so let's do that, if
;; space doesn't matter
@ -996,13 +1026,35 @@
operands[2] = negate_rtx (HImode, operands[2]);
}")
;;;;- logical shift instructions
;;(define_insn "lshrsi3"
;; [(set (match_operand:HI 0 "register_operand" "=r")
;; (lshiftrt:HI (match_operand:HI 1 "register_operand" "0")
;; (match_operand:HI 2 "general_operand" "rI")))]
;; ""
;; "srl %0,%2")
(define_expand "lshrhi3"
[(match_operand:HI 0 "register_operand" "")
(match_operand:HI 1 "register_operand" "")
(match_operand:HI 2 "general_operand" "")]
""
"
{
rtx r;
if (!TARGET_40_PLUS &&
(GET_CODE (operands[2]) != CONST_INT ||
(unsigned) INTVAL (operands[2]) > 3))
FAIL;
emit_insn (gen_lsrhi1 (operands[0], operands[1]));
if (GET_CODE (operands[2]) != CONST_INT)
{
r = gen_reg_rtx (HImode);
emit_insn (gen_subhi3 (r, operands [2], GEN_INT (1)));
emit_insn (gen_ashrhi3 (operands[0], operands[0], r));
}
else if ((unsigned) INTVAL (operands[2]) != 1)
{
emit_insn (gen_ashlhi3 (operands[0], operands[0],
GEN_INT (1 - INTVAL (operands[2]))));
}
DONE;
}
"
)
;; absolute