diff options
Diffstat (limited to 'gcc/cse.c')
| -rw-r--r-- | gcc/cse.c | 27 |
1 files changed, 16 insertions, 11 deletions
@@ -5506,6 +5506,22 @@ cse_insn (rtx insn, rtx libcall_insn) break; } + /* Reject certain invalid forms of CONST that we create. */ + else if (CONSTANT_P (trial) + && GET_CODE (trial) == CONST + /* Reject cases that will cause decode_rtx_const to + die. On the alpha when simplifying a switch, we + get (const (truncate (minus (label_ref) + (label_ref)))). */ + && (GET_CODE (XEXP (trial, 0)) == TRUNCATE + /* Likewise on IA-64, except without the + truncate. */ + || (GET_CODE (XEXP (trial, 0)) == MINUS + && GET_CODE (XEXP (XEXP (trial, 0), 0)) == LABEL_REF + && GET_CODE (XEXP (XEXP (trial, 0), 1)) == LABEL_REF))) + /* Do nothing for this case. */ + ; + /* Look for a substitution that makes a valid insn. */ else if (validate_change (insn, &SET_SRC (sets[i].rtl), trial, 0)) { @@ -5541,17 +5557,6 @@ cse_insn (rtx insn, rtx libcall_insn) else if (constant_pool_entries_cost && CONSTANT_P (trial) - /* Reject cases that will cause decode_rtx_const to - die. On the alpha when simplifying a switch, we - get (const (truncate (minus (label_ref) - (label_ref)))). */ - && ! (GET_CODE (trial) == CONST - && GET_CODE (XEXP (trial, 0)) == TRUNCATE) - /* Likewise on IA-64, except without the truncate. */ - && ! (GET_CODE (trial) == CONST - && GET_CODE (XEXP (trial, 0)) == MINUS - && GET_CODE (XEXP (XEXP (trial, 0), 0)) == LABEL_REF - && GET_CODE (XEXP (XEXP (trial, 0), 1)) == LABEL_REF) && (src_folded == 0 || (!MEM_P (src_folded) && ! src_folded_force_flag)) |