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tcg/ppc: Use prefixed instructions in tcg_out_mem_long

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When the offset is out of range of the non-prefixed insn, but
fits the 34-bit immediate of the prefixed insn, use that.

Reviewed-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-08-04 17:16:32 +00:00
parent 103044e406
commit 1f8e4dc182
1 changed files with 66 additions and 0 deletions
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66
tcg/ppc/tcg-target.c.inc
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@ -329,6 +329,15 @@ static bool tcg_target_const_match(int64_t val, TCGType type, int ct, int vece)
#define STDX XO31(149)
#define STQ XO62( 2)
#define PLWA OPCD( 41)
#define PLD OPCD( 57)
#define PLXSD OPCD( 42)
#define PLXV OPCD(25 * 2 + 1) /* force tx=1 */
#define PSTD OPCD( 61)
#define PSTXSD OPCD( 46)
#define PSTXV OPCD(27 * 2 + 1) /* force sx=1 */
#define ADDIC OPCD( 12)
#define ADDI OPCD( 14)
#define ADDIS OPCD( 15)
@ -737,6 +746,20 @@ static ptrdiff_t tcg_pcrel_diff_for_prefix(TCGContext *s, const void *target)
return tcg_pcrel_diff(s, target) - (tcg_out_need_prefix_align(s) ? 4 : 0);
}
/* Output Type 00 Prefix - 8-Byte Load/Store Form (8LS:D) */
static void tcg_out_8ls_d(TCGContext *s, tcg_insn_unit opc, unsigned rt,
unsigned ra, tcg_target_long imm, bool r)
{
tcg_insn_unit p, i;
p = OPCD(1) | (r << 20) | ((imm >> 16) & 0x3ffff);
i = opc | TAI(rt, ra, imm);
tcg_out_prefix_align(s);
tcg_out32(s, p);
tcg_out32(s, i);
}
/* Output Type 10 Prefix - Modified Load/Store Form (MLS:D) */
static void tcg_out_mls_d(TCGContext *s, tcg_insn_unit opc, unsigned rt,
unsigned ra, tcg_target_long imm, bool r)
@ -1418,6 +1441,49 @@ static void tcg_out_mem_long(TCGContext *s, int opi, int opx, TCGReg rt,
break;
}
/* For unaligned or large offsets, use the prefixed form. */
if (have_isa_3_10
&& (offset != (int16_t)offset || (offset & align))
&& offset == sextract64(offset, 0, 34)) {
/*
* Note that the MLS:D insns retain their un-prefixed opcode,
* while the 8LS:D insns use a different opcode space.
*/
switch (opi) {
case LBZ:
case LHZ:
case LHA:
case LWZ:
case STB:
case STH:
case STW:
case ADDI:
tcg_out_mls_d(s, opi, rt, base, offset, 0);
return;
case LWA:
tcg_out_8ls_d(s, PLWA, rt, base, offset, 0);
return;
case LD:
tcg_out_8ls_d(s, PLD, rt, base, offset, 0);
return;
case STD:
tcg_out_8ls_d(s, PSTD, rt, base, offset, 0);
return;
case LXSD:
tcg_out_8ls_d(s, PLXSD, rt & 31, base, offset, 0);
return;
case STXSD:
tcg_out_8ls_d(s, PSTXSD, rt & 31, base, offset, 0);
return;
case LXV:
tcg_out_8ls_d(s, PLXV, rt & 31, base, offset, 0);
return;
case STXV:
tcg_out_8ls_d(s, PSTXV, rt & 31, base, offset, 0);
return;
}
}
/* For unaligned, or very large offsets, use the indexed form. */
if (offset & align || offset != (int32_t)offset || opi == 0) {
if (rs == base) {