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avr.c (out_movhi_r_mr): Only SBIW if X is not unused after.

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* config/avr/avr.c (out_movhi_r_mr) [REG_X + PLUS]: Only SBIW if
	X is not unused after.

From-SVN: r242909
This commit is contained in:
Georg-Johann Lay 2016-11-28 09:28:45 +00:00 committed by Georg-Johann Lay
parent 03612f2527
commit 193273638f
2 changed files with 20 additions and 9 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2016-11-28 Georg-Johann Lay <avr@gjlay.de>
* config/avr/avr.c (out_movhi_r_mr) [REG_X + PLUS]: Only SBIW if
X is not unused after.
2016-11-28 Bernd Schmidt <bschmidt@redhat.com>
PR rtl-optimization/78120

24
gcc/config/avr/avr.c
View File

@ -4028,16 +4028,22 @@ out_movhi_r_mr (rtx_insn *insn, rtx op[], int *plen)
optimization options. */
if (reg_base == REG_X)
return reg_base == reg_dest
? avr_asm_len ("adiw r26,%o1" CR_TAB
"ld __tmp_reg__,X+" CR_TAB
"ld %B0,X" CR_TAB
"mov %A0,__tmp_reg__", op, plen, -4)
{
if (reg_base == reg_dest)
return avr_asm_len ("adiw r26,%o1" CR_TAB
"ld __tmp_reg__,X+" CR_TAB
"ld %B0,X" CR_TAB
"mov %A0,__tmp_reg__", op, plen, -4);
: avr_asm_len ("adiw r26,%o1" CR_TAB
"ld %A0,X+" CR_TAB
"ld %B0,X" CR_TAB
"sbiw r26,%o1+1", op, plen, -4);
avr_asm_len ("adiw r26,%o1" CR_TAB
"ld %A0,X+" CR_TAB
"ld %B0,X", op, plen, -3);
if (!reg_unused_after (insn, XEXP (base, 0)))
avr_asm_len ("sbiw r26,%o1+1", op, plen, 1);
return "";
}
return reg_base == reg_dest
? avr_asm_len ("ldd __tmp_reg__,%A1" CR_TAB