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Diffstat (limited to 'gcc/config/cris/cris.c')
| -rw-r--r-- | gcc/config/cris/cris.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/gcc/config/cris/cris.c b/gcc/config/cris/cris.c index 1d0a34b9abb..88d89993a9e 100644 --- a/gcc/config/cris/cris.c +++ b/gcc/config/cris/cris.c @@ -1796,6 +1796,21 @@ cris_rtx_costs (rtx x, int code, int outer_code, int *total, return true; case MULT: + /* If we have one arm of an ADDI, make sure it gets the cost of + one insn, i.e. zero cost for this operand, and just the cost + of the PLUS, as the insn is created by combine from a PLUS + and an ASHIFT, and the MULT cost below would make the + combined value be larger than the separate insns. The insn + validity is checked elsewhere by combine. + + FIXME: this case is a stop-gap for 4.3 and 4.4, this whole + function should be rewritten. */ + if (outer_code == PLUS && BIAP_INDEX_P (x)) + { + *total = 0; + return true; + } + /* Identify values that are no powers of two. Powers of 2 are taken care of already and those values should not be changed. */ if (!CONST_INT_P (XEXP (x, 1)) |