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[ARM] fix movdi expander to avoid illegal ldrd/strd

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* config/arm/arm.md (movdi): Avoid odd-number ldrd/strd in ARM state.

From-SVN: r225461
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Alan Lawrence 2015-07-06 16:21:55 +00:00 committed by Alan Lawrence
parent 385e3f0c2b
commit 9c769a65e9
2 changed files with 40 additions and 0 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2015-07-06 Alan Lawrence <alan.lawrence@arm.com>
* config/arm/arm.md (movdi): Avoid odd-number ldrd/strd in ARM state.
2015-07-06 Richard Biener <rguenther@suse.de>
PR tree-optimization/66772

36
gcc/config/arm/arm.md
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@ -5481,6 +5481,42 @@
if (!REG_P (operands[0]))
operands[1] = force_reg (DImode, operands[1]);
}
if (REG_P (operands[0]) && REGNO (operands[0]) < FIRST_VIRTUAL_REGISTER
&& !HARD_REGNO_MODE_OK (REGNO (operands[0]), DImode))
{
/* Avoid LDRD's into an odd-numbered register pair in ARM state
when expanding function calls. */
gcc_assert (can_create_pseudo_p ());
if (MEM_P (operands[1]) && MEM_VOLATILE_P (operands[1]))
{
/* Perform load into legal reg pair first, then move. */
rtx reg = gen_reg_rtx (DImode);
emit_insn (gen_movdi (reg, operands[1]));
operands[1] = reg;
}
emit_move_insn (gen_lowpart (SImode, operands[0]),
gen_lowpart (SImode, operands[1]));
emit_move_insn (gen_highpart (SImode, operands[0]),
gen_highpart (SImode, operands[1]));
DONE;
}
else if (REG_P (operands[1]) && REGNO (operands[1]) < FIRST_VIRTUAL_REGISTER
&& !HARD_REGNO_MODE_OK (REGNO (operands[1]), DImode))
{
/* Avoid STRD's from an odd-numbered register pair in ARM state
when expanding function prologue. */
gcc_assert (can_create_pseudo_p ());
rtx split_dest = (MEM_P (operands[0]) && MEM_VOLATILE_P (operands[0]))
? gen_reg_rtx (DImode)
: operands[0];
emit_move_insn (gen_lowpart (SImode, split_dest),
gen_lowpart (SImode, operands[1]));
emit_move_insn (gen_highpart (SImode, split_dest),
gen_highpart (SImode, operands[1]));
if (split_dest != operands[0])
emit_insn (gen_movdi (operands[0], split_dest));
DONE;
}
"
)