diff options
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/avr/avr.md | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/gcc/config/avr/avr.md b/gcc/config/avr/avr.md index 57f4a08..c10709e 100644 --- a/gcc/config/avr/avr.md +++ b/gcc/config/avr/avr.md @@ -1724,12 +1724,28 @@ (match_operand:ALL2 2 "nonmemory_or_const_operand" "r,s,IJ YIJ,n Ynn")))] "" "#" - "&& reload_completed" + "&& 1" [(parallel [(set (match_dup 0) (plus:ALL2 (match_dup 1) (match_dup 2))) (clobber (reg:CC REG_CC))])] - "" + { + // Passes like combine and fwprop1 may remove the scratch from an + // addhi3 insn. Add the scratch again because having a QImode + // scratch reg available is better than spilling the operands in + // the case when we don't get a d-regs register. + if (! reload_completed + && const_operand (operands[2], <MODE>mode) + && ! stack_register_operand (operands[0], HImode) + && ! stack_register_operand (operands[1], HImode)) + { + emit (gen_add<mode>3_clobber (operands[0], operands[1], operands[2])); + DONE; + } + + if (! reload_completed) + FAIL; + } [(set_attr "isa" "*,*,adiw,*")]) ;; "*addhi3" |