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(gen_shl_and, gen_shl_sext): use gen_lowpart to generate rtx in the appropriate mode for zero/sign-extension.

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(gen_shl_and, gen_shl_sext): use gen_lowpart to
generate rtx in the appropriate mode for zero/sign-extension.
Don't generate a zero bit shift.
(gen_shl_sext) directly use gen_ashift instead of gen_ashrsi3 .

From-SVN: r12884
This commit is contained in:
Jim Wilson 1996-09-30 14:45:47 -07:00
parent 5156628f9f
commit afad3d2c26
1 changed files with 40 additions and 28 deletions
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68
gcc/config/sh/sh.c
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@ -1232,10 +1232,10 @@ gen_shl_and (dest, left_rtx, mask_rtx, source)
if (first < 0)
{
emit_insn ((mask << right) == 0xff
? gen_zero_extendqisi2(dest, gen_rtx (SUBREG, QImode,
source, 0))
: gen_zero_extendhisi2(dest, gen_rtx (SUBREG, HImode,
source, 0)));
? gen_zero_extendqisi2(dest,
gen_lowpart (QImode, source))
: gen_zero_extendhisi2(dest,
gen_lowpart (HImode, source)));
source = dest;
}
if (source != dest)
@ -1255,10 +1255,8 @@ gen_shl_and (dest, left_rtx, mask_rtx, source)
}
if (first >= 0)
emit_insn (mask == 0xff
? gen_zero_extendqisi2(dest, gen_rtx (SUBREG, QImode,
dest, 0))
: gen_zero_extendhisi2(dest, gen_rtx (SUBREG, HImode,
dest, 0)));
? gen_zero_extendqisi2(dest, gen_lowpart (QImode, dest))
: gen_zero_extendhisi2(dest, gen_lowpart (HImode, dest)));
if (total_shift > 0)
{
operands[2] = GEN_INT (total_shift);
@ -1283,10 +1281,13 @@ gen_shl_and (dest, left_rtx, mask_rtx, source)
source = dest;
}
emit_insn (gen_andsi3 (dest, source, GEN_INT (mask)));
operands[0] = dest;
operands[1] = dest;
operands[2] = GEN_INT (total_shift);
shift_gen_fun (ASHIFT, operands);
if (total_shift)
{
operands[0] = dest;
operands[1] = dest;
operands[2] = GEN_INT (total_shift);
shift_gen_fun (ASHIFT, operands);
}
break;
}
else
@ -1351,6 +1352,8 @@ shl_sext_kind (left_rtx, size_rtx, costp)
{
/* 16 bit shift / sign extend / 16 bit shift */
cost = shift_insns[16 - insize] + 1 + ashiftrt_insns[16 - size];
/* If ashiftrt_insns[16 - size] is 8, this choice will be overridden
below, by alternative 3 or something even better. */
if (cost < best_cost)
{
kind = 5;
@ -1470,41 +1473,50 @@ gen_shl_sext (dest, left_rtx, size_rtx, source)
if (dest != source)
emit_insn (gen_movsi (dest, source));
operands[0] = dest;
operands[2] = GEN_INT (ext - insize);
gen_shifty_hi_op (ASHIFT, operands);
if (ext - insize)
{
operands[2] = GEN_INT (ext - insize);
gen_shifty_hi_op (ASHIFT, operands);
}
emit_insn (kind & 1
? gen_extendqisi2(dest, gen_rtx (SUBREG, QImode, dest, 0))
: gen_extendhisi2(dest, gen_rtx (SUBREG, HImode, dest, 0)));
? gen_extendqisi2(dest, gen_lowpart (QImode, dest))
: gen_extendhisi2(dest, gen_lowpart (HImode, dest)));
if (kind <= 2)
{
operands[2] = GEN_INT (shift2);
gen_shifty_op (ASHIFT, operands);
if (shift2)
{
operands[2] = GEN_INT (shift2);
gen_shifty_op (ASHIFT, operands);
}
}
else
{
if (shift2 >= 0)
if (shift2 > 0)
{
operands[2] = GEN_INT (shift2);
gen_shifty_hi_op (ASHIFT, operands);
}
else
else if (shift2)
{
operands[2] = GEN_INT (-shift2);
gen_shifty_hi_op (LSHIFTRT, operands);
}
emit_insn (size <= 8
? gen_extendqisi2 (dest,
gen_rtx (SUBREG, QImode, dest, 0))
: gen_extendhisi2 (dest,
gen_rtx (SUBREG, HImode, dest, 0)));
? gen_extendqisi2 (dest, gen_lowpart (QImode, dest))
: gen_extendhisi2 (dest, gen_lowpart (HImode, dest)));
}
break;
}
case 5:
emit_insn (gen_shl_sext_ext (dest, source, GEN_INT (16 - insize),
GEN_INT (16)));
emit_insn (gen_ashrsi3 (dest, dest, GEN_INT (16 - size)));
break;
{
int i = 16 - size;
emit_insn (gen_shl_sext_ext (dest, source, GEN_INT (16 - insize),
GEN_INT (16)));
/* Don't use gen_ashrsi3 because it generates new pseudos. */
while (--i >= 0)
gen_ashift (ASHIFTRT, 1, dest);
break;
}
case 6:
case 7:
/* Don't expand fine-grained when combining, because that will