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Fix bitfield insert/extract aliasing problem found by GNAT. 

* mips.md (insv, extzv, extv): Add change_address call.
	(movsi_ulw, movsi_usw): Change QImode to BLKmode in pattern.

From-SVN: r16331
This commit is contained in:
Jim Wilson 1997-11-05 01:49:52 +00:00 committed by Jim Wilson
parent 474eff8855
commit 4911814e8e
2 changed files with 15 additions and 3 deletions
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3
gcc/ChangeLog
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@ -1,5 +1,8 @@
Tue Nov 4 16:55:11 1997 Jim Wilson <wilson@cygnus.com>
* mips.md (insv, extzv, extv): Add change_address call.
(movsi_ulw, movsi_usw): Change QImode to BLKmode in pattern.
* integrate.c (save_for_inline_copying): Copy parm_reg_stack_loc.
* reload.c (find_reloads, case 'm' and 'o'): Reject HIGH constants.

15
gcc/config/mips/mips.md
View File

@ -3152,6 +3152,9 @@ move\\t%0,%z4\\n\\
if (GET_CODE (operands[1]) != MEM)
FAIL;
/* Change the mode to BLKmode for aliasing purposes. */
operands[1] = change_address (operands[1], BLKmode, XEXP (operands[1], 0));
/* Otherwise, emit a lwl/lwr pair to load the value. */
emit_insn (gen_movsi_ulw (operands[0], operands[1]));
DONE;
@ -3176,6 +3179,9 @@ move\\t%0,%z4\\n\\
if (GET_CODE (operands[1]) != MEM)
FAIL;
/* Change the mode to BLKmode for aliasing purposes. */
operands[1] = change_address (operands[1], BLKmode, XEXP (operands[1], 0));
/* Otherwise, emit a lwl/lwr pair to load the value. */
emit_insn (gen_movsi_ulw (operands[0], operands[1]));
DONE;
@ -3200,6 +3206,9 @@ move\\t%0,%z4\\n\\
if (GET_CODE (operands[0]) != MEM)
FAIL;
/* Change the mode to BLKmode for aliasing purposes. */
operands[0] = change_address (operands[0], BLKmode, XEXP (operands[0], 0));
/* Otherwise, emit a swl/swr pair to load the value. */
emit_insn (gen_movsi_usw (operands[0], operands[3]));
DONE;
@ -3209,7 +3218,7 @@ move\\t%0,%z4\\n\\
(define_insn "movsi_ulw"
[(set (match_operand:SI 0 "register_operand" "=&d,&d")
(unspec:SI [(match_operand:QI 1 "general_operand" "R,o")] 0))]
(unspec:SI [(match_operand:BLK 1 "general_operand" "R,o")] 0))]
""
"*
{
@ -3237,8 +3246,8 @@ move\\t%0,%z4\\n\\
(set_attr "length" "2,4")])
(define_insn "movsi_usw"
[(set (match_operand:QI 0 "memory_operand" "=R,o")
(unspec:QI [(match_operand:SI 1 "reg_or_0_operand" "dJ,dJ")] 1))]
[(set (match_operand:BLK 0 "memory_operand" "=R,o")
(unspec:BLK [(match_operand:SI 1 "reg_or_0_operand" "dJ,dJ")] 1))]
""
"*
{