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[PATCH][AARCH64]Use mov for add with large immediate. 

gcc/

2015-05-05  Renlin Li  <renlin.li@arm.com>

	* config/aarch64/aarch64.md (add<mode>3): Use mov when allowed.

From-SVN: r222800
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Renlin Li 2015-05-05 10:16:46 +00:00 committed by Renlin Li
parent ae8ffbbb8d
commit 53e38f0275
2 changed files with 22 additions and 8 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2015-05-05 Renlin Li <renlin.li@arm.com>
* config/aarch64/aarch64.md (add<mode>3): Use mov when allowed.
2015-05-05 Yvan Roux <yvan.roux@linaro.org>
* config/aarch64/aarch64-elf-raw.h (CA53_ERR_843419_SPEC): Define.

26
gcc/config/aarch64/aarch64.md
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@ -1414,18 +1414,28 @@
"
if (! aarch64_plus_operand (operands[2], VOIDmode))
{
rtx subtarget = ((optimize && can_create_pseudo_p ())
? gen_reg_rtx (<MODE>mode) : operands[0]);
HOST_WIDE_INT imm = INTVAL (operands[2]);
if (imm < 0)
imm = -(-imm & ~0xfff);
if (aarch64_move_imm (imm, <MODE>mode) && can_create_pseudo_p ())
{
rtx tmp = gen_reg_rtx (<MODE>mode);
emit_move_insn (tmp, operands[2]);
operands[2] = tmp;
}
else
imm &= ~0xfff;
{
rtx subtarget = ((optimize && can_create_pseudo_p ())
? gen_reg_rtx (<MODE>mode) : operands[0]);
emit_insn (gen_add<mode>3 (subtarget, operands[1], GEN_INT (imm)));
operands[1] = subtarget;
operands[2] = GEN_INT (INTVAL (operands[2]) - imm);
if (imm < 0)
imm = -(-imm & ~0xfff);
else
imm &= ~0xfff;
emit_insn (gen_add<mode>3 (subtarget, operands[1], GEN_INT (imm)));
operands[1] = subtarget;
operands[2] = GEN_INT (INTVAL (operands[2]) - imm);
}
}
"
)