diff options
Diffstat (limited to 'gcc/config/avr/avr.c')
| -rw-r--r-- | gcc/config/avr/avr.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/gcc/config/avr/avr.c b/gcc/config/avr/avr.c index f9dd603..543bb9c 100644 --- a/gcc/config/avr/avr.c +++ b/gcc/config/avr/avr.c @@ -8836,7 +8836,13 @@ avr_regno_mode_code_ok_for_base_p (int regno, LEN != NULL: set *LEN to the length of the instruction sequence (in words) printed with LEN = NULL. If CLEAR_P is true, OP[0] had been cleard to Zero already. - If CLEAR_P is false, nothing is known about OP[0]. */ + If CLEAR_P is false, nothing is known about OP[0]. + + The effect on cc0 is as follows: + + Load 0 to any register : NONE + Load ld register with any value : NONE + Anything else: : CLOBBER */ static void output_reload_in_const (rtx *op, rtx clobber_reg, int *len, bool clear_p) @@ -8914,7 +8920,7 @@ output_reload_in_const (rtx *op, rtx clobber_reg, int *len, bool clear_p) xop[2] = clobber_reg; if (n >= 2 + (avr_current_arch->n_segments > 1)) - avr_asm_len ("clr %0", xop, len, 1); + avr_asm_len ("mov %0,__zero_reg__", xop, len, 1); else avr_asm_len (asm_code[n][ldreg_p], xop, len, ldreg_p ? 1 : 2); continue; @@ -8946,14 +8952,13 @@ output_reload_in_const (rtx *op, rtx clobber_reg, int *len, bool clear_p) } } - /* Use CLR to zero a value so that cc0 is set as expected - for zero. */ + /* Don't use CLR so that cc0 is set as expected. */ if (ival[n] == 0) { if (!clear_p) - avr_asm_len ("clr %0", &xdest[n], len, 1); - + avr_asm_len (ldreg_p ? "ldi %0,0" : "mov %0,__zero_reg__", + &xdest[n], len, 1); continue; } |