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recog.c (check_asm_operands): Treat indeterminate operand ok results as success. 

* recog.c (check_asm_operands): Treat indeterminate operand ok
        results as success.  Try harder to resolve a matching constraint.
        * stmt.c (expand_asm_operands): Recognize when an output operand's
        constraint does not allow memory.  Treat indeterminate operand ok
        results as failure.  Try harder to resolve a matching constraint.

From-SVN: r24959
This commit is contained in:
Richard Henderson 1999-02-01 12:03:23 -08:00 committed by Richard Henderson
parent 5326f06d7f
commit 1afbe1c4e6
3 changed files with 59 additions and 14 deletions
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8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
Mon Feb 1 20:00:40 1999 Richard Henderson <rth@cygnus.com>
* recog.c (check_asm_operands): Treat indeterminate operand ok
results as success. Try harder to resolve a matching constraint.
* stmt.c (expand_asm_operands): Recognize when an output operand's
constraint does not allow memory. Treat indeterminate operand ok
results as failure. Try harder to resolve a matching constraint.
Mon Feb 1 15:00:02 1999 Ken Raeburn <raeburn@cygnus.com>
Use varrays for constant-equivalence data:

32
gcc/recog.c
View File

@ -188,7 +188,9 @@ check_asm_operands (x)
for (i = 0; i < noperands; i++)
{
const char *c = constraints[i];
if (ISDIGIT ((unsigned char)c[0]))
if (c[0] == '%')
c++;
if (ISDIGIT ((unsigned char)c[0]) && c[1] == '\0')
c = constraints[c[0] - '0'];
if (! asm_operand_ok (operands[i], c))
@ -1550,13 +1552,16 @@ decode_asm_operands (body, operands, operand_locs, constraints, modes)
return template;
}
/* Check if an asm_operand matches it's constraints. */
/* Check if an asm_operand matches it's constraints.
Return > 0 if ok, = 0 if bad, < 0 if inconclusive. */
int
asm_operand_ok (op, constraint)
rtx op;
const char *constraint;
{
int result = 0;
/* Use constrain_operands after reload. */
if (reload_completed)
abort ();
@ -1578,9 +1583,11 @@ asm_operand_ok (op, constraint)
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
/* Our caller is supposed to have given us the proper
matching constraint. */
/* abort (); */
/* For best results, our caller should have given us the
proper matching constraint, but we can't actually fail
the check if they didn't. Indicate that results are
inconclusive. */
result = -1;
break;
case 'p':
@ -1600,15 +1607,24 @@ asm_operand_ok (op, constraint)
break;
case '<':
/* ??? Before flow, auto inc/dec insns are not supposed to exist,
excepting those that expand_call created. Further, on some
machines which do not have generalized auto inc/dec, an inc/dec
is not a memory_operand.
Match any memory and hope things are resolved after reload. */
if (GET_CODE (op) == MEM
&& (GET_CODE (XEXP (op, 0)) == PRE_DEC
&& (1
|| GET_CODE (XEXP (op, 0)) == PRE_DEC
|| GET_CODE (XEXP (op, 0)) == POST_DEC))
return 1;
break;
case '>':
if (GET_CODE (op) == MEM
&& (GET_CODE (XEXP (op, 0)) == PRE_INC
&& (1
|| GET_CODE (XEXP (op, 0)) == PRE_INC
|| GET_CODE (XEXP (op, 0)) == POST_INC))
return 1;
break;
@ -1745,7 +1761,7 @@ asm_operand_ok (op, constraint)
}
}
return 0;
return result;
}
/* Given an rtx *P, if it is a sum containing an integer constant term,

33
gcc/stmt.c
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@ -1251,6 +1251,7 @@ expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line)
int j;
int is_inout = 0;
int allows_reg = 0;
int allows_mem = 0;
/* If there's an erroneous arg, emit no insn. */
if (TREE_TYPE (val) == error_mark_node)
@ -1316,8 +1317,7 @@ expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line)
break;
case '?': case '!': case '*': case '&':
case 'V': case 'm': case 'o': case '<': case '>':
case 'E': case 'F': case 'G': case 'H': case 'X':
case 'E': case 'F': case 'G': case 'H':
case 's': case 'i': case 'n':
case 'I': case 'J': case 'K': case 'L': case 'M':
case 'N': case 'O': case 'P': case ',':
@ -1331,7 +1331,23 @@ expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line)
error ("matching constraint not valid in output operand");
break;
case 'p': case 'g': case 'r':
case 'V': case 'm': case 'o':
allows_mem = 1;
break;
case '<': case '>':
/* ??? Before flow, auto inc/dec insns are not supposed to exist,
excepting those that expand_call created. So match memory
and hope. */
allows_mem = 1;
break;
case 'g': case 'X':
allows_reg = 1;
allows_mem = 1;
break;
case 'p': case 'r':
default:
allows_reg = 1;
break;
@ -1342,8 +1358,10 @@ expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line)
Make the asm insn write into that, then our caller will copy it to
the real output operand. Likewise for promoted variables. */
if (TREE_CODE (val) == INDIRECT_REF
if ((TREE_CODE (val) == INDIRECT_REF
&& allows_mem)
|| (TREE_CODE_CLASS (TREE_CODE (val)) == 'd'
&& (allows_mem || GET_CODE (DECL_RTL (val)) == REG)
&& ! (GET_CODE (DECL_RTL (val)) == REG
&& GET_MODE (DECL_RTL (val)) != TYPE_MODE (type)))
|| ! allows_reg
@ -1358,6 +1376,8 @@ expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line)
if (! allows_reg && GET_CODE (output_rtx[i]) != MEM)
error ("output number %d not directly addressable", i);
if (! allows_mem && GET_CODE (output_rtx[i]) == MEM)
error ("output number %d not restored to memory", i);
}
else
{
@ -1472,7 +1492,8 @@ expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line)
}
/* Try and find the real constraint for this dup. */
if (j == 0 && c_len == 1)
if ((j == 0 && c_len == 1)
|| (j == 1 && c_len == 2 && constraint[0] == '%'))
{
tree o = outputs;
for (j = constraint[j] - '0'; j > 0; --j)
@ -1502,7 +1523,7 @@ expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line)
op = expand_expr (TREE_VALUE (tail), NULL_RTX, VOIDmode, 0);
if (! asm_operand_ok (op, constraint))
if (asm_operand_ok (op, constraint) <= 0)
{
if (allows_reg)
op = force_reg (TYPE_MODE (TREE_TYPE (TREE_VALUE (tail))), op);