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riscv-gcc-1
Commit 45ca2106 by Kazu Hirata Committed by Kazu Hirata
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h8300-protos.h: Add a prototype for compute_a_shift_cc. 

	* config/h8300/h8300-protos.h: Add a prototype for
	compute_a_shift_cc.
	* config/h8300/h8300.c (shift_one): Update the CC status.
	(shift_two): Likewise.
	(output_a_shift_cc): Set cc_inline and cc_special.
	(compute_a_shift_cc): New.
	* config/h8300/h8300.md (shift insns): Use compute_a_shift_cc.

From-SVN: r65251
parent 7c2aa9d7
Showing with 174 additions and 44 deletions
gcc/ChangeLog
2003-04-04 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300-protos.h: Add a prototype for
compute_a_shift_cc.
* config/h8300/h8300.c (shift_one): Update the CC status.
(shift_two): Likewise.
(output_a_shift_cc): Set cc_inline and cc_special.
(compute_a_shift_cc): New.
* config/h8300/h8300.md (shift insns): Use compute_a_shift_cc.
2003-04-04 Richard Henderson <rth@redhat.com> 2003-04-04 Richard Henderson <rth@redhat.com>
* cse.c (fold_rtx): Fix 03-30 change; do check insn non-null. * cse.c (fold_rtx): Fix 03-30 change; do check insn non-null.
......
gcc/config/h8300/h8300-protos.h
...@@ -31,6 +31,7 @@ extern unsigned int compute_plussi_length PARAMS ((rtx *)); ...@@ -31,6 +31,7 @@ extern unsigned int compute_plussi_length PARAMS ((rtx *));
extern int compute_plussi_cc PARAMS ((rtx *)); extern int compute_plussi_cc PARAMS ((rtx *));
extern const char *output_a_shift PARAMS ((rtx *)); extern const char *output_a_shift PARAMS ((rtx *));
extern unsigned int compute_a_shift_length PARAMS ((rtx, rtx *)); extern unsigned int compute_a_shift_length PARAMS ((rtx, rtx *));
extern int compute_a_shift_cc PARAMS ((rtx, rtx *));
extern const char *emit_a_rotate PARAMS ((enum rtx_code, rtx *)); extern const char *emit_a_rotate PARAMS ((enum rtx_code, rtx *));
extern const char *output_simode_bld PARAMS ((int, rtx[])); extern const char *output_simode_bld PARAMS ((int, rtx[]));
extern void print_operand_address PARAMS ((FILE *, rtx)); extern void print_operand_address PARAMS ((FILE *, rtx));
......
gcc/config/h8300/h8300.c
...@@ -2661,42 +2661,42 @@ static const struct shift_insn shift_one[2][3][3] = ...@@ -2661,42 +2661,42 @@ static const struct shift_insn shift_one[2][3][3] =
{ {
/* SHIFT_ASHIFT */ /* SHIFT_ASHIFT */
{ {
{ "shll\t%X0", CC_NO_CARRY }, { "shll\t%X0", CC_SET_ZNV },
{ "add.w\t%T0,%T0", CC_OVERFLOW_UNUSABLE | CC_NO_CARRY }, { "add.w\t%T0,%T0", CC_SET_ZN },
{ "add.w\t%f0,%f0\n\taddx\t%y0,%y0\n\taddx\t%z0,%z0", 0 } { "add.w\t%f0,%f0\n\taddx\t%y0,%y0\n\taddx\t%z0,%z0", CC_CLOBBER }
}, },
/* SHIFT_LSHIFTRT */ /* SHIFT_LSHIFTRT */
{ {
{ "shlr\t%X0", CC_NO_CARRY }, { "shlr\t%X0", CC_SET_ZNV },
{ "shlr\t%t0\n\trotxr\t%s0", 0 }, { "shlr\t%t0\n\trotxr\t%s0", CC_CLOBBER },
{ "shlr\t%z0\n\trotxr\t%y0\n\trotxr\t%x0\n\trotxr\t%w0", 0 } { "shlr\t%z0\n\trotxr\t%y0\n\trotxr\t%x0\n\trotxr\t%w0", CC_CLOBBER }
}, },
/* SHIFT_ASHIFTRT */ /* SHIFT_ASHIFTRT */
{ {
{ "shar\t%X0", CC_OVERFLOW_UNUSABLE | CC_NO_CARRY }, { "shar\t%X0", CC_SET_ZNV },
{ "shar\t%t0\n\trotxr\t%s0", 0 }, { "shar\t%t0\n\trotxr\t%s0", CC_CLOBBER },
{ "shar\t%z0\n\trotxr\t%y0\n\trotxr\t%x0\n\trotxr\t%w0", 0 } { "shar\t%z0\n\trotxr\t%y0\n\trotxr\t%x0\n\trotxr\t%w0", CC_CLOBBER }
} }
}, },
/* H8/300H */ /* H8/300H */
{ {
/* SHIFT_ASHIFT */ /* SHIFT_ASHIFT */
{ {
{ "shll.b\t%X0", CC_NO_CARRY }, { "shll.b\t%X0", CC_SET_ZNV },
{ "shll.w\t%T0", CC_NO_CARRY }, { "shll.w\t%T0", CC_SET_ZNV },
{ "shll.l\t%S0", CC_NO_CARRY } { "shll.l\t%S0", CC_SET_ZNV }
}, },
/* SHIFT_LSHIFTRT */ /* SHIFT_LSHIFTRT */
{ {
{ "shlr.b\t%X0", CC_NO_CARRY }, { "shlr.b\t%X0", CC_SET_ZNV },
{ "shlr.w\t%T0", CC_NO_CARRY }, { "shlr.w\t%T0", CC_SET_ZNV },
{ "shlr.l\t%S0", CC_NO_CARRY } { "shlr.l\t%S0", CC_SET_ZNV }
}, },
/* SHIFT_ASHIFTRT */ /* SHIFT_ASHIFTRT */
{ {
{ "shar.b\t%X0", CC_OVERFLOW_UNUSABLE | CC_NO_CARRY }, { "shar.b\t%X0", CC_SET_ZNV },
{ "shar.w\t%T0", CC_OVERFLOW_UNUSABLE | CC_NO_CARRY }, { "shar.w\t%T0", CC_SET_ZNV },
{ "shar.l\t%S0", CC_OVERFLOW_UNUSABLE | CC_NO_CARRY } { "shar.l\t%S0", CC_SET_ZNV }
} }
} }
}; };
...@@ -2705,21 +2705,21 @@ static const struct shift_insn shift_two[3][3] = ...@@ -2705,21 +2705,21 @@ static const struct shift_insn shift_two[3][3] =
{ {
/* SHIFT_ASHIFT */ /* SHIFT_ASHIFT */
{ {
{ "shll.b\t#2,%X0", CC_NO_CARRY }, { "shll.b\t#2,%X0", CC_SET_ZNV },
{ "shll.w\t#2,%T0", CC_NO_CARRY }, { "shll.w\t#2,%T0", CC_SET_ZNV },
{ "shll.l\t#2,%S0", CC_NO_CARRY } { "shll.l\t#2,%S0", CC_SET_ZNV }
}, },
/* SHIFT_LSHIFTRT */ /* SHIFT_LSHIFTRT */
{ {
{ "shlr.b\t#2,%X0", CC_NO_CARRY }, { "shlr.b\t#2,%X0", CC_SET_ZNV },
{ "shlr.w\t#2,%T0", CC_NO_CARRY }, { "shlr.w\t#2,%T0", CC_SET_ZNV },
{ "shlr.l\t#2,%S0", CC_NO_CARRY } { "shlr.l\t#2,%S0", CC_SET_ZNV }
}, },
/* SHIFT_ASHIFTRT */ /* SHIFT_ASHIFTRT */
{ {
{ "shar.b\t#2,%X0", CC_OVERFLOW_UNUSABLE | CC_NO_CARRY }, { "shar.b\t#2,%X0", CC_SET_ZNV },
{ "shar.w\t#2,%T0", CC_OVERFLOW_UNUSABLE | CC_NO_CARRY }, { "shar.w\t#2,%T0", CC_SET_ZNV },
{ "shar.l\t#2,%S0", CC_OVERFLOW_UNUSABLE | CC_NO_CARRY } { "shar.l\t#2,%S0", CC_SET_ZNV }
} }
}; };
...@@ -2814,8 +2814,11 @@ struct shift_info { ...@@ -2814,8 +2814,11 @@ struct shift_info {
or SHIFT_SPECIAL, and REMAINDER is nonzero. */ or SHIFT_SPECIAL, and REMAINDER is nonzero. */
const char *shift2; const char *shift2;
/* Valid CC flags. */ /* CC status for SHIFT_INLINE. */
int cc_valid_p; int cc_inline;
/* CC status for SHIFT_SPECIAL. */
int cc_special;
}; };
static void get_shift_alg PARAMS ((enum shift_type, static void get_shift_alg PARAMS ((enum shift_type,
...@@ -2885,13 +2888,13 @@ get_shift_alg (shift_type, shift_mode, count, info) ...@@ -2885,13 +2888,13 @@ get_shift_alg (shift_type, shift_mode, count, info)
/* It is up to the caller to know that looping clobbers cc. */ /* It is up to the caller to know that looping clobbers cc. */
info->shift1 = shift_one[cpu_type][shift_type][shift_mode].assembler; info->shift1 = shift_one[cpu_type][shift_type][shift_mode].assembler;
info->shift2 = shift_two[shift_type][shift_mode].assembler; info->shift2 = shift_two[shift_type][shift_mode].assembler;
info->cc_valid_p = shift_one[cpu_type][shift_type][shift_mode].cc_valid; info->cc_inline = shift_one[cpu_type][shift_type][shift_mode].cc_valid;
goto end; goto end;
case SHIFT_ROT_AND: case SHIFT_ROT_AND:
info->shift1 = rotate_one[cpu_type][shift_type][shift_mode]; info->shift1 = rotate_one[cpu_type][shift_type][shift_mode];
info->shift2 = rotate_two[shift_type][shift_mode]; info->shift2 = rotate_two[shift_type][shift_mode];
info->cc_valid_p = 0; info->cc_inline = CC_CLOBBER;
goto end; goto end;
case SHIFT_SPECIAL: case SHIFT_SPECIAL:
...@@ -2899,7 +2902,8 @@ get_shift_alg (shift_type, shift_mode, count, info) ...@@ -2899,7 +2902,8 @@ get_shift_alg (shift_type, shift_mode, count, info)
info->remainder = 0; info->remainder = 0;
info->shift1 = shift_one[cpu_type][shift_type][shift_mode].assembler; info->shift1 = shift_one[cpu_type][shift_type][shift_mode].assembler;
info->shift2 = shift_two[shift_type][shift_mode].assembler; info->shift2 = shift_two[shift_type][shift_mode].assembler;
info->cc_valid_p = 0; info->cc_inline = shift_one[cpu_type][shift_type][shift_mode].cc_valid;
info->cc_special = CC_CLOBBER;
break; break;
} }
...@@ -2953,10 +2957,12 @@ get_shift_alg (shift_type, shift_mode, count, info) ...@@ -2953,10 +2957,12 @@ get_shift_alg (shift_type, shift_mode, count, info)
{ {
info->special = "mov.b\t%t0,%s0\n\tsub.b\t%t0,%t0"; info->special = "mov.b\t%t0,%s0\n\tsub.b\t%t0,%t0";
info->shift1 = "shlr.b\t%s0"; info->shift1 = "shlr.b\t%s0";
info->cc_inline = CC_SET_ZNV;
} }
else else
{ {
info->special = "mov.b\t%t0,%s0\n\textu.w\t%T0"; info->special = "mov.b\t%t0,%s0\n\textu.w\t%T0";
info->cc_special = CC_SET_ZNV;
} }
goto end; goto end;
case SHIFT_ASHIFTRT: case SHIFT_ASHIFTRT:
...@@ -2968,6 +2974,7 @@ get_shift_alg (shift_type, shift_mode, count, info) ...@@ -2968,6 +2974,7 @@ get_shift_alg (shift_type, shift_mode, count, info)
else else
{ {
info->special = "mov.b\t%t0,%s0\n\texts.w\t%T0"; info->special = "mov.b\t%t0,%s0\n\texts.w\t%T0";
info->cc_special = CC_SET_ZNV;
} }
goto end; goto end;
} }
...@@ -2988,7 +2995,10 @@ get_shift_alg (shift_type, shift_mode, count, info) ...@@ -2988,7 +2995,10 @@ get_shift_alg (shift_type, shift_mode, count, info)
if (TARGET_H8300) if (TARGET_H8300)
info->special = "mov.b\t%t0,%s0\n\tshll.b\t%s0\n\tsubx.b\t%t0,%t0\n\tshll.b\t%s0\n\tmov.b\t%t0,%s0\n\tbst.b\t#0,%s0"; info->special = "mov.b\t%t0,%s0\n\tshll.b\t%s0\n\tsubx.b\t%t0,%t0\n\tshll.b\t%s0\n\tmov.b\t%t0,%s0\n\tbst.b\t#0,%s0";
else if (TARGET_H8300H) else if (TARGET_H8300H)
{
info->special = "shll.b\t%t0\n\tsubx.b\t%s0,%s0\n\tshll.b\t%t0\n\trotxl.b\t%s0\n\texts.w\t%T0"; info->special = "shll.b\t%t0\n\tsubx.b\t%s0,%s0\n\tshll.b\t%t0\n\trotxl.b\t%s0\n\texts.w\t%T0";
info->cc_special = CC_SET_ZNV;
}
else /* TARGET_H8300S */ else /* TARGET_H8300S */
abort (); abort ();
goto end; goto end;
...@@ -3065,9 +3075,11 @@ get_shift_alg (shift_type, shift_mode, count, info) ...@@ -3065,9 +3075,11 @@ get_shift_alg (shift_type, shift_mode, count, info)
{ {
case SHIFT_ASHIFT: case SHIFT_ASHIFT:
info->special = "shlr.w\t%e0\n\tmov.w\t%f0,%e0\n\txor.w\t%f0,%f0\n\trotxr.l\t%S0"; info->special = "shlr.w\t%e0\n\tmov.w\t%f0,%e0\n\txor.w\t%f0,%f0\n\trotxr.l\t%S0";
info->cc_special = CC_SET_ZNV;
goto end; goto end;
case SHIFT_LSHIFTRT: case SHIFT_LSHIFTRT:
info->special = "shll.w\t%f0\n\tmov.w\t%e0,%f0\n\txor.w\t%e0,%e0\n\trotxl.l\t%S0"; info->special = "shll.w\t%f0\n\tmov.w\t%e0,%f0\n\txor.w\t%e0,%e0\n\trotxl.l\t%S0";
info->cc_special = CC_SET_ZNV;
goto end; goto end;
case SHIFT_ASHIFTRT: case SHIFT_ASHIFTRT:
abort (); abort ();
...@@ -3095,6 +3107,7 @@ get_shift_alg (shift_type, shift_mode, count, info) ...@@ -3095,6 +3107,7 @@ get_shift_alg (shift_type, shift_mode, count, info)
else else
{ {
info->special = "mov.w\t%e0,%f0\n\textu.l\t%S0"; info->special = "mov.w\t%e0,%f0\n\textu.l\t%S0";
info->cc_special = CC_SET_ZNV;
} }
goto end; goto end;
case SHIFT_ASHIFTRT: case SHIFT_ASHIFTRT:
...@@ -3106,6 +3119,7 @@ get_shift_alg (shift_type, shift_mode, count, info) ...@@ -3106,6 +3119,7 @@ get_shift_alg (shift_type, shift_mode, count, info)
else else
{ {
info->special = "mov.w\t%e0,%f0\n\texts.l\t%S0"; info->special = "mov.w\t%e0,%f0\n\texts.l\t%S0";
info->cc_special = CC_SET_ZNV;
} }
goto end; goto end;
} }
...@@ -3119,14 +3133,17 @@ get_shift_alg (shift_type, shift_mode, count, info) ...@@ -3119,14 +3133,17 @@ get_shift_alg (shift_type, shift_mode, count, info)
case SHIFT_ASHIFT: case SHIFT_ASHIFT:
info->special = "mov.b\t%w0,%z0\n\tsub.b\t%y0,%y0\n\tsub.w\t%f0,%f0"; info->special = "mov.b\t%w0,%z0\n\tsub.b\t%y0,%y0\n\tsub.w\t%f0,%f0";
info->shift1 = "shll.b\t%z0"; info->shift1 = "shll.b\t%z0";
info->cc_inline = CC_SET_ZNV;
goto end; goto end;
case SHIFT_LSHIFTRT: case SHIFT_LSHIFTRT:
info->special = "mov.b\t%z0,%w0\n\tsub.b\t%x0,%x0\n\tsub.w\t%e0,%e0"; info->special = "mov.b\t%z0,%w0\n\tsub.b\t%x0,%x0\n\tsub.w\t%e0,%e0";
info->shift1 = "shlr.b\t%w0"; info->shift1 = "shlr.b\t%w0";
info->cc_inline = CC_SET_ZNV;
goto end; goto end;
case SHIFT_ASHIFTRT: case SHIFT_ASHIFTRT:
info->special = "mov.b\t%z0,%w0\n\tbld\t#7,%w0\n\tsubx\t%x0,%x0\n\tsubx\t%x0,%x0\n\tsubx\t%x0,%x0"; info->special = "mov.b\t%z0,%w0\n\tbld\t#7,%w0\n\tsubx\t%x0,%x0\n\tsubx\t%x0,%x0\n\tsubx\t%x0,%x0";
info->shift1 = "shar.b\t%w0"; info->shift1 = "shar.b\t%w0";
info->cc_inline = CC_SET_ZNV;
goto end; goto end;
} }
} }
...@@ -3142,9 +3159,11 @@ get_shift_alg (shift_type, shift_mode, count, info) ...@@ -3142,9 +3159,11 @@ get_shift_alg (shift_type, shift_mode, count, info)
goto end; goto end;
case SHIFT_LSHIFTRT: case SHIFT_LSHIFTRT:
info->special = "mov.w\t%e0,%f0\n\tmov.b\t%t0,%s0\n\textu.w\t%f0\n\textu.l\t%S0"; info->special = "mov.w\t%e0,%f0\n\tmov.b\t%t0,%s0\n\textu.w\t%f0\n\textu.l\t%S0";
info->cc_special = CC_SET_ZNV;
goto end; goto end;
case SHIFT_ASHIFTRT: case SHIFT_ASHIFTRT:
info->special = "mov.w\t%e0,%f0\n\tmov.b\t%t0,%s0\n\texts.w\t%f0\n\texts.l\t%S0"; info->special = "mov.w\t%e0,%f0\n\tmov.b\t%t0,%s0\n\texts.w\t%f0\n\texts.l\t%S0";
info->cc_special = CC_SET_ZNV;
goto end; goto end;
} }
} }
...@@ -3160,7 +3179,10 @@ get_shift_alg (shift_type, shift_mode, count, info) ...@@ -3160,7 +3179,10 @@ get_shift_alg (shift_type, shift_mode, count, info)
goto end; goto end;
case SHIFT_LSHIFTRT: case SHIFT_LSHIFTRT:
if (TARGET_H8300H) if (TARGET_H8300H)
{
info->special = "sub.w\t%f0,%f0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\textu.l\t%S0"; info->special = "sub.w\t%f0,%f0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\textu.l\t%S0";
info->cc_special = CC_SET_ZNV;
}
else else
info->special = "sub.w\t%f0,%f0\n\trotl.l\t#2,%S0\n\trotl.l\t#2,%S0\n\textu.l\t%S0"; info->special = "sub.w\t%f0,%f0\n\trotl.l\t#2,%S0\n\trotl.l\t#2,%S0\n\textu.l\t%S0";
goto end; goto end;
...@@ -3180,9 +3202,15 @@ get_shift_alg (shift_type, shift_mode, count, info) ...@@ -3180,9 +3202,15 @@ get_shift_alg (shift_type, shift_mode, count, info)
goto end; goto end;
case SHIFT_LSHIFTRT: case SHIFT_LSHIFTRT:
if (TARGET_H8300H) if (TARGET_H8300H)
{
info->special = "sub.w\t%f0,%f0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\textu.l\t%S0"; info->special = "sub.w\t%f0,%f0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\trotl.l\t%S0\n\textu.l\t%S0";
info->cc_special = CC_SET_ZNV;
}
else else
{
info->special = "sub.w\t%f0,%f0\n\trotl.l\t#2,%S0\n\trotl.l\t%S0\n\textu.l\t%S0"; info->special = "sub.w\t%f0,%f0\n\trotl.l\t#2,%S0\n\trotl.l\t%S0\n\textu.l\t%S0";
info->cc_special = CC_SET_ZNV;
}
goto end; goto end;
case SHIFT_ASHIFTRT: case SHIFT_ASHIFTRT:
abort (); abort ();
...@@ -3231,12 +3259,15 @@ get_shift_alg (shift_type, shift_mode, count, info) ...@@ -3231,12 +3259,15 @@ get_shift_alg (shift_type, shift_mode, count, info)
{ {
case SHIFT_ASHIFT: case SHIFT_ASHIFT:
info->special = "shlr.l\t%S0\n\txor.l\t%S0,%S0\n\trotxr.l\t%S0"; info->special = "shlr.l\t%S0\n\txor.l\t%S0,%S0\n\trotxr.l\t%S0";
info->cc_special = CC_SET_ZNV;
goto end; goto end;
case SHIFT_LSHIFTRT: case SHIFT_LSHIFTRT:
info->special = "shll.l\t%S0\n\txor.l\t%S0,%S0\n\trotxl.l\t%S0"; info->special = "shll.l\t%S0\n\txor.l\t%S0,%S0\n\trotxl.l\t%S0";
info->cc_special = CC_SET_ZNV;
goto end; goto end;
case SHIFT_ASHIFTRT: case SHIFT_ASHIFTRT:
info->special = "shll\t%e0\n\tsubx\t%w0,%w0\n\texts.w\t%T0\n\texts.l\t%S0"; info->special = "shll\t%e0\n\tsubx\t%w0,%w0\n\texts.w\t%T0\n\texts.l\t%S0";
info->cc_special = CC_SET_ZNV;
goto end; goto end;
} }
} }
...@@ -3390,13 +3421,6 @@ output_a_shift (operands) ...@@ -3390,13 +3421,6 @@ output_a_shift (operands)
/* Now emit one bit shifts for any residual. */ /* Now emit one bit shifts for any residual. */
for (; n > 0; n--) for (; n > 0; n--)
output_asm_insn (info.shift1, operands); output_asm_insn (info.shift1, operands);
/* Keep track of CC. */
if (info.cc_valid_p)
{
cc_status.value1 = operands[0];
cc_status.flags |= info.cc_valid_p;
}
return ""; return "";
case SHIFT_ROT_AND: case SHIFT_ROT_AND:
...@@ -3431,8 +3455,6 @@ output_a_shift (operands) ...@@ -3431,8 +3455,6 @@ output_a_shift (operands)
else else
abort (); abort ();
cc_status.value1 = operands[0];
cc_status.flags |= CC_NO_CARRY;
output_asm_insn (insn_buf, operands); output_asm_insn (insn_buf, operands);
return ""; return "";
} }
...@@ -3631,6 +3653,100 @@ compute_a_shift_length (insn, operands) ...@@ -3631,6 +3653,100 @@ compute_a_shift_length (insn, operands)
} }
} }
int
compute_a_shift_cc (insn, operands)
rtx insn ATTRIBUTE_UNUSED;
rtx *operands;
{
rtx shift = operands[3];
enum machine_mode mode = GET_MODE (shift);
enum rtx_code code = GET_CODE (shift);
enum shift_type shift_type;
enum shift_mode shift_mode;
struct shift_info info;
switch (mode)
{
case QImode:
shift_mode = QIshift;
break;
case HImode:
shift_mode = HIshift;
break;
case SImode:
shift_mode = SIshift;
break;
default:
abort ();
}
switch (code)
{
case ASHIFTRT:
shift_type = SHIFT_ASHIFTRT;
break;
case LSHIFTRT:
shift_type = SHIFT_LSHIFTRT;
break;
case ASHIFT:
shift_type = SHIFT_ASHIFT;
break;
default:
abort ();
}
if (GET_CODE (operands[2]) != CONST_INT)
{
/* This case must be taken care of by one of the two splitters
that convert a variable shift into a loop. */
abort ();
}
else
{
int n = INTVAL (operands[2]);
/* If the count is negative, make it 0. */
if (n < 0)
n = 0;
/* If the count is too big, truncate it.
ANSI says shifts of GET_MODE_BITSIZE are undefined - we choose to
do the intuitive thing. */
else if ((unsigned int) n > GET_MODE_BITSIZE (mode))
n = GET_MODE_BITSIZE (mode);
get_shift_alg (shift_type, shift_mode, n, &info);
switch (info.alg)
{
case SHIFT_SPECIAL:
if (info.remainder == 0)
return info.cc_special;
/* Fall through. */
case SHIFT_INLINE:
return info.cc_inline;
case SHIFT_ROT_AND:
/* This case always ends with an and instruction. */
return CC_SET_ZNV;
case SHIFT_LOOP:
/* A loop to shift by a "large" constant value.
If we have shift-by-2 insns, use them. */
if (info.shift2 != NULL)
{
if (n % 2)
return info.cc_inline;
}
return CC_CLOBBER;
default:
abort ();
}
}
}
/* A rotation by a non-constant will cause a loop to be generated, in /* A rotation by a non-constant will cause a loop to be generated, in
which a rotation by one bit is used. A rotation by a constant, which a rotation by one bit is used. A rotation by a constant,
including the one in the loop, will be taken care of by including the one in the loop, will be taken care of by
......
gcc/config/h8300/h8300.md
...@@ -2272,7 +2272,8 @@ ...@@ -2272,7 +2272,8 @@
"* return output_a_shift (operands);" "* return output_a_shift (operands);"
[(set (attr "length") [(set (attr "length")
(symbol_ref "compute_a_shift_length (insn, operands)")) (symbol_ref "compute_a_shift_length (insn, operands)"))
(set_attr "cc" "clobber")]) (set (attr "cc")
(symbol_ref "compute_a_shift_cc (insn, operands)"))])
;; HI BIT SHIFTS ;; HI BIT SHIFTS
...@@ -2307,7 +2308,8 @@ ...@@ -2307,7 +2308,8 @@
"* return output_a_shift (operands);" "* return output_a_shift (operands);"
[(set (attr "length") [(set (attr "length")
(symbol_ref "compute_a_shift_length (insn, operands)")) (symbol_ref "compute_a_shift_length (insn, operands)"))
(set_attr "cc" "clobber")]) (set (attr "cc")
(symbol_ref "compute_a_shift_cc (insn, operands)"))])
;; SI BIT SHIFTS ;; SI BIT SHIFTS
...@@ -2342,7 +2344,8 @@ ...@@ -2342,7 +2344,8 @@
"* return output_a_shift (operands);" "* return output_a_shift (operands);"
[(set (attr "length") [(set (attr "length")
(symbol_ref "compute_a_shift_length (insn, operands)")) (symbol_ref "compute_a_shift_length (insn, operands)"))
(set_attr "cc" "clobber")]) (set (attr "cc")
(symbol_ref "compute_a_shift_cc (insn, operands)"))])
;; Split a variable shift into a loop. If the register containing ;; Split a variable shift into a loop. If the register containing
;; the shift count dies, then we just use that register. ;; the shift count dies, then we just use that register.
......
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