diff options
Diffstat (limited to 'gcc/rtl.def')
| -rw-r--r-- | gcc/rtl.def | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/gcc/rtl.def b/gcc/rtl.def index 6a0b73e87ff..fcad7ec4b21 100644 --- a/gcc/rtl.def +++ b/gcc/rtl.def @@ -56,6 +56,7 @@ Boston, MA 02111-1307, USA. */ "i" an rtx code for a machine insn (INSN, JUMP_INSN, CALL_INSN) "m" an rtx code for something that matches in insns (e.g, MATCH_DUP) "g" an rtx code for grouping insns together (e.g, GROUP_PARALLEL) + "a" an rtx code for autoincrement addressing modes (e.g. POST_DEC) "x" everything else */ @@ -756,18 +757,25 @@ DEF_RTL_EXPR(UMAX, "umax", "ee", 'c') containing MEM. These operations exist in only two cases: 1. pushes onto the stack. 2. created automatically by the life_analysis pass in flow.c. */ -DEF_RTL_EXPR(PRE_DEC, "pre_dec", "e", 'x') -DEF_RTL_EXPR(PRE_INC, "pre_inc", "e", 'x') -DEF_RTL_EXPR(POST_DEC, "post_dec", "e", 'x') -DEF_RTL_EXPR(POST_INC, "post_inc", "e", 'x') +DEF_RTL_EXPR(PRE_DEC, "pre_dec", "e", 'a') +DEF_RTL_EXPR(PRE_INC, "pre_inc", "e", 'a') +DEF_RTL_EXPR(POST_DEC, "post_dec", "e", 'a') +DEF_RTL_EXPR(POST_INC, "post_inc", "e", 'a') /* These binary operations are used to represent generic address side-effects in memory addresses, except for simple incrementation or decrementation which use the above operations. They are - created automatically by the life_analysis pass in flow.c. - (Note that these operators are currently placeholders.) */ -DEF_RTL_EXPR(PRE_MODIFY, "pre_modify", "ee", 'x') -DEF_RTL_EXPR(POST_MODIFY, "post_modify", "ee", 'x') + created automatically by the life_analysis pass in flow.c. + The first operand is a REG which is used as the address. + The second operand is an expression that is assigned to the + register, either before (PRE_MODIFY) or after (POST_MODIFY) + evaluating the address. + Currently, the compiler can only handle second operands of the + form (plus (reg) (reg)) and (plus (reg) (const_int)), where + the first operand of the PLUS has to be the same register as + the first operand of the *_MODIFY. */ +DEF_RTL_EXPR(PRE_MODIFY, "pre_modify", "ee", 'a') +DEF_RTL_EXPR(POST_MODIFY, "post_modify", "ee", 'a') /* Comparison operations. The ordered comparisons exist in two flavors, signed and unsigned. */ |
