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re PR target/39423 ([SH] performance regression: lost mov @(disp,Rn))

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PR target/39423
	* config/sh/sh.md (*movhi_index_disp): Add support for SH2A movu.w insn.

	PR target/39423
	* gcc.target/sh/pr39423-2.c: New.

From-SVN: r190579
This commit is contained in:
Oleg Endo 2012-08-21 23:34:54 +00:00
parent 1aee89910a
commit 082ea1dcd5
4 changed files with 52 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2012-08-21 Oleg Endo <olegendo@gcc.gnu.org>
PR target/39423
* config/sh/sh.md (*movhi_index_disp): Add support for SH2A movu.w insn.
2012-08-21 H.J. Lu <hongjiu.lu@intel.com>
PR middle-end/54332

33
gcc/config/sh/sh.md
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@ -5793,12 +5793,35 @@ label:
(clobber (reg:SI T_REG))]
"TARGET_SH1"
"#"
"&& 1"
[(parallel [(set (match_dup 0) (sign_extend:SI (match_dup 1)))
(clobber (reg:SI T_REG))])
(set (match_dup 0) (zero_extend:SI (match_dup 2)))]
"&& can_create_pseudo_p ()"
[(const_int 0)]
{
operands[2] = gen_lowpart (HImode, operands[0]);
rtx mem = operands[1];
rtx plus0_rtx = XEXP (mem, 0);
rtx plus1_rtx = XEXP (plus0_rtx, 0);
rtx mult_rtx = XEXP (plus1_rtx, 0);
rtx op_1 = XEXP (mult_rtx, 0);
rtx op_2 = GEN_INT (exact_log2 (INTVAL (XEXP (mult_rtx, 1))));
rtx op_3 = XEXP (plus1_rtx, 1);
rtx op_4 = XEXP (plus0_rtx, 1);
rtx op_5 = gen_reg_rtx (SImode);
rtx op_6 = gen_reg_rtx (SImode);
rtx op_7 = replace_equiv_address (mem, gen_rtx_PLUS (SImode, op_6, op_4));
emit_insn (gen_ashlsi3 (op_5, op_1, op_2));
emit_insn (gen_addsi3 (op_6, op_5, op_3));
/* On SH2A the movu.w insn can be used for zero extending loads. */
if (TARGET_SH2A)
emit_insn (gen_zero_extendhisi2 (operands[0], op_7));
else
{
emit_insn (gen_extendhisi2 (operands[0], op_7));
emit_insn (gen_zero_extendhisi2 (operands[0],
gen_lowpart (HImode, operands[0])));
}
DONE;
})
(define_insn_and_split "*movsi_index_disp"

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2012-08-21 Oleg Endo <olegendo@gcc.gnu.org>
PR target/39423
* gcc.target/sh/pr39423-2.c: New.
2012-08-21 Marc Glisse <marc.glisse@inria.fr>
* gcc.dg/tree-ssa/forwprop-19.c: New testcase.

14
gcc/testsuite/gcc.target/sh/pr39423-2.c Normal file
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@ -0,0 +1,14 @@
/* Check that displacement addressing is used for indexed addresses with a
small offset, instead of re-calculating the index and that the movu.w
instruction is used on SH2A. */
/* { dg-do compile { target "sh*-*-*" } } */
/* { dg-options "-O2" } */
/* { dg-skip-if "" { "sh*-*-*" } { "*" } { "-m2a*" } } */
/* { dg-final { scan-assembler-not "add\t#1" } } */
/* { dg-final { scan-assembler "movu.w" } } */
int
test_00 (unsigned short tab[], int index)
{
return tab[index + 1];
}