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deal with block move input reg also being a scratch reg. 

From-SVN: r4691
This commit is contained in:
Michael Meissner 1993-06-18 17:36:27 +00:00
parent aa8642c95d
commit 4bb89a8e5c
1 changed files with 21 additions and 9 deletions
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30
gcc/config/mips/mips.c
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@ -2201,6 +2201,7 @@ output_block_move (insn, operands, num_regs, move_type)
int offset = 0;
int use_lwl_lwr = FALSE;
int last_operand = num_regs+4;
int safe_regs = 4;
int i;
rtx xoperands[10];
@ -2215,20 +2216,31 @@ output_block_move (insn, operands, num_regs, move_type)
} load_store[4];
/* Detect a bug in GCC, where it can give us a register
the same as one of the addressing registers. */
for (i = 4; i < last_operand; i++)
the same as one of the addressing registers and reduce
the number of registers available. */
for (i = 4;
i < last_operand && safe_regs < (sizeof(xoperands) / sizeof(xoperands[0]));
i++)
{
if (reg_mentioned_p (operands[i], operands[0])
|| reg_mentioned_p (operands[i], operands[1]))
{
abort_with_insn (insn, "register passed as address and temp register to block move");
}
if (!reg_mentioned_p (operands[i], operands[0])
&& !reg_mentioned_p (operands[i], operands[1]))
xoperands[safe_regs++] = operands[i];
}
if (safe_regs < last_operand)
{
xoperands[0] = operands[0];
xoperands[1] = operands[1];
xoperands[2] = operands[2];
xoperands[3] = operands[3];
return output_block_move (insn, xoperands, safe_regs-4, move_type);
}
/* If we are given global or static addresses, and we would be
emitting a few instructions, try to save time by using a
temporary register for the pointer. */
if (bytes > 2*align || move_type != BLOCK_MOVE_NORMAL)
if (num_regs > 2 && (bytes > 2*align || move_type != BLOCK_MOVE_NORMAL))
{
if (CONSTANT_P (src_reg))
{
@ -2263,7 +2275,7 @@ output_block_move (insn, operands, num_regs, move_type)
num_regs = (sizeof (load_store) / sizeof (load_store[0]));
else if (num_regs < 1)
abort ();
abort_with_insn (insn, "Cannot do block move, not enough scratch registers");
if (TARGET_GAS && move_type != BLOCK_MOVE_LAST && set_noreorder++ == 0)
output_asm_insn (".set\tnoreorder", operands);