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(output_move_double): Fix up the test for overlap

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of source address with operands[0].

From-SVN: r5987
This commit is contained in:
Richard Stallman 1993-11-03 21:16:16 +00:00
parent 5ac6158d0b
commit 3a58400f85
1 changed files with 12 additions and 4 deletions
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16
gcc/config/m68k/m68k.c
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@ -1077,11 +1077,14 @@ output_move_double (operands)
if (optype0 == REGOP
&& (optype1 == OFFSOP || optype1 == MEMOP))
{
if (reg_overlap_mentioned_p (operands[0], XEXP (operands[1], 0))
rtx testlow = gen_rtx (REG, SImode, REGNO (operands[0]));
if (reg_overlap_mentioned_p (testlow, XEXP (operands[1], 0))
&& reg_overlap_mentioned_p (latehalf[0], XEXP (operands[1], 0)))
{
/* If both halves of dest are used in the src memory address,
compute the address into latehalf of dest. */
compute the address into latehalf of dest.
Note that this can't happen if the dest is two data regs. */
compadr:
xops[0] = latehalf[0];
xops[1] = XEXP (operands[1], 0);
@ -1102,8 +1105,13 @@ compadr:
&& reg_overlap_mentioned_p (middlehalf[0],
XEXP (operands[1], 0)))
{
/* Check for two regs used by both source and dest. */
if (reg_overlap_mentioned_p (operands[0], XEXP (operands[1], 0))
/* Check for two regs used by both source and dest.
Note that this can't happen if the dest is all data regs.
It can happen if the dest is d6, d7, a0.
But in that case, latehalf is an addr reg, so
the code at compadr does ok. */
if (reg_overlap_mentioned_p (testlow, XEXP (operands[1], 0))
|| reg_overlap_mentioned_p (latehalf[0], XEXP (operands[1], 0)))
goto compadr;