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re PR target/65249 (unable to find a register to spill in class 'R0_REGS' when compiling protobuf on sh4)

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PR target/65249
* config/sh/sh.md (movdi): Split simple reg move to two movsi when
  the destination is R0 so as to lower R0-register pressure.

From-SVN: r225856
This commit is contained in:
Kaz Kojima 2015-07-16 00:48:33 +00:00
parent 58b1eb4330
commit fdc2ce3fb0
2 changed files with 24 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2015-07-16 Kaz Kojima <kkojima@gcc.gnu.org>
PR target/65249
* config/sh/sh.md (movdi): Split simple reg move to two movsi
when the destination is R0.
2015-07-16 Uros Bizjak <ubizjak@gmail.com>
PR target/66866

18
gcc/config/sh/sh.md
View File

@ -7892,6 +7892,24 @@ label:
""
{
prepare_move_operands (operands, DImode);
if (TARGET_SH1)
{
/* When the dest operand is (R0, R1) register pair, split it to
two movsi of which dest is R1 and R0 so as to lower R0-register
pressure on the first movsi. Apply only for simple source not
to make complex rtl here. */
if (REG_P (operands[0])
&& REGNO (operands[0]) == R0_REG
&& REG_P (operands[1])
&& REGNO (operands[1]) >= FIRST_PSEUDO_REGISTER)
{
emit_insn (gen_movsi (gen_rtx_REG (SImode, R1_REG),
gen_rtx_SUBREG (SImode, operands[1], 4)));
emit_insn (gen_movsi (gen_rtx_REG (SImode, R0_REG),
gen_rtx_SUBREG (SImode, operands[1], 0)));
DONE;
}
}
})
(define_insn "movdf_media"