mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

tcg/s390: Support bswap flags

Browse Source 
For INDEX_op_bswap16_i64, use 64-bit instructions so that we can
easily provide the extension to 64-bits.  Drop the special case,
previously used, where the input is already zero-extended -- the
minor code size savings is not worth the complication.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-06-13 14:15:41 -04:00
parent 780b573fce
commit 1619ee9e93
1 changed files with 28 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
tcg/s390/tcg-target.c.inc
View File

@ -1951,15 +1951,37 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
tgen_ext16u(s, TCG_TYPE_I32, args[0], args[1]);
break;
OP_32_64(bswap16):
/* The TCG bswap definition requires bits 0-47 already be zero.
Thus we don't need the G-type insns to implement bswap16_i64. */
tcg_out_insn(s, RRE, LRVR, args[0], args[1]);
tcg_out_sh32(s, RS_SRL, args[0], TCG_REG_NONE, 16);
case INDEX_op_bswap16_i32:
a0 = args[0], a1 = args[1], a2 = args[2];
tcg_out_insn(s, RRE, LRVR, a0, a1);
if (a2 & TCG_BSWAP_OS) {
tcg_out_sh32(s, RS_SRA, a0, TCG_REG_NONE, 16);
} else {
tcg_out_sh32(s, RS_SRL, a0, TCG_REG_NONE, 16);
}
break;
OP_32_64(bswap32):
case INDEX_op_bswap16_i64:
a0 = args[0], a1 = args[1], a2 = args[2];
tcg_out_insn(s, RRE, LRVGR, a0, a1);
if (a2 & TCG_BSWAP_OS) {
tcg_out_sh64(s, RSY_SRAG, a0, a0, TCG_REG_NONE, 48);
} else {
tcg_out_sh64(s, RSY_SRLG, a0, a0, TCG_REG_NONE, 48);
}
break;
case INDEX_op_bswap32_i32:
tcg_out_insn(s, RRE, LRVR, args[0], args[1]);
break;
case INDEX_op_bswap32_i64:
a0 = args[0], a1 = args[1], a2 = args[2];
tcg_out_insn(s, RRE, LRVR, a0, a1);
if (a2 & TCG_BSWAP_OS) {
tgen_ext32s(s, a0, a0);
} else if ((a2 & (TCG_BSWAP_IZ | TCG_BSWAP_OZ)) == TCG_BSWAP_OZ) {
tgen_ext32u(s, a0, a0);
}
break;
case INDEX_op_add2_i32:
if (const_args[4]) {