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(output_move_double): Divert first word via the stack 

if it's a register used in the input operand.

From-SVN: r2602
This commit is contained in:
Richard Stallman 1992-10-25 22:21:26 +00:00
parent 555b950bd1
commit 81fd0956da
1 changed files with 17 additions and 0 deletions
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17
gcc/config/i386/i386.c
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@ -42,6 +42,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#define AT_BP(mode) (gen_rtx (MEM, (mode), frame_pointer_rtx))
extern rtx gen_push_operand ();
extern FILE *asm_out_file;
extern char *strcat ();
@ -243,6 +244,7 @@ output_move_double (operands)
enum {REGOP, OFFSOP, MEMOP, PUSHOP, POPOP, CNSTOP, RNDOP } optype0, optype1;
rtx latehalf[2];
rtx addreg0 = 0, addreg1 = 0;
rtx pop_after = 0;
/* First classify both operands. */
@ -352,6 +354,16 @@ output_move_double (operands)
&& reg_overlap_mentioned_p (stack_pointer_rtx, operands[1]))
operands[1] = latehalf[1];
/* For (set (reg:DI N) (mem:DI ... (reg:SI N) ...)),
push the first word on the stack, and pop it off afterward. */
if (optype0 == REGOP
&& refers_to_regno_p (REGNO (operands[0]), REGNO (operands[0]) + 1,
operands[1], 0))
{
pop_after = operands[0];
operands[0] = gen_rtx (MEM, SImode, gen_push_operand ());
}
/* If one or both operands autodecrementing,
do the two words, high-numbered first. */
@ -402,6 +414,11 @@ output_move_double (operands)
if (addreg1)
asm_add (-4, addreg1);
/* If we diverted a word to the stack, pop it now
to the proper register. */
if (pop_after != 0)
output_asm_insn ("pop%L0 %0", &pop_after);
return "";
}