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target/arm: Restructure disas_fp_int_conv

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For opcodes 0-5, move some if conditions into the structure
of a switch statement. For opcodes 6 & 7, decode everything
at once with a second switch.

Backports commit 3c3ff68492c2d00bd8cb39ed2d02bdaf5caf5cb8 from qemu
This commit is contained in:
Richard Henderson 2019-02-22 18:38:57 -05:00 committed by Lioncash
parent 5c153537f5
commit d6fbc0f4f3
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 49 additions and 45 deletions
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94
qemu/target/arm/translate-a64.c
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@ -6659,68 +6659,72 @@ static void disas_fp_int_conv(DisasContext *s, uint32_t insn)
int type = extract32(insn, 22, 2);
bool sbit = extract32(insn, 29, 1);
bool sf = extract32(insn, 31, 1);
bool itof = false;
if (sbit) {
unallocated_encoding(s);
return;
goto do_unallocated;
}
if (opcode > 5) {
/* FMOV */
bool itof = opcode & 1;
if (rmode >= 2) {
unallocated_encoding(s);
return;
}
switch (sf << 3 | type << 1 | rmode) {
case 0x0: /* 32 bit */
case 0xa: /* 64 bit */
case 0xd: /* 64 bit to top half of quad */
break;
case 0x6: /* 16-bit float, 32-bit int */
case 0xe: /* 16-bit float, 64-bit int */
if (dc_isar_feature(aa64_fp16, s)) {
break;
}
/* fallthru */
default:
/* all other sf/type/rmode combinations are invalid */
unallocated_encoding(s);
return;
}
if (!fp_access_check(s)) {
return;
}
handle_fmov(s, rd, rn, type, itof);
} else {
/* actual FP conversions */
bool itof = extract32(opcode, 1, 1);
if (rmode != 0 && opcode > 1) {
unallocated_encoding(s);
return;
switch (opcode) {
case 2: /* SCVTF */
case 3: /* UCVTF */
itof = true;
/* fallthru */
case 4: /* FCVTAS */
case 5: /* FCVTAU */
if (rmode != 0) {
goto do_unallocated;
}
/* fallthru */
case 0: /* FCVT[NPMZ]S */
case 1: /* FCVT[NPMZ]U */
switch (type) {
case 0: /* float32 */
case 1: /* float64 */
break;
case 3: /* float16 */
if (dc_isar_feature(aa64_fp16, s)) {
break;
if (!dc_isar_feature(aa64_fp16, s)) {
goto do_unallocated;
}
/* fallthru */
break;
default:
unallocated_encoding(s);
return;
goto do_unallocated;
}
if (!fp_access_check(s)) {
return;
}
handle_fpfpcvt(s, rd, rn, opcode, itof, rmode, 64, sf, type);
break;
default:
switch (sf << 7 | type << 5 | rmode << 3 | opcode) {
case 0x66: /* FMOV half <-> 32-bit int */
case 0x67:
case 0xE6: /* FMOV half <-> 64-bit int */
case 0xE7:
if (!dc_isar_feature(aa64_fp16, s)) {
goto do_unallocated;
}
/* fallthru */
case 0x06: /* FMOV 32-bit */
case 0x07:
case 0xA6: /* FMOV 64-bit */
case 0xA7:
case 0xCE: /* FMOV top half of 128-bit */
case 0xCF:
if (!fp_access_check(s)) {
return;
}
itof = opcode & 1;
handle_fmov(s, rd, rn, type, itof);
break;
default:
do_unallocated:
unallocated_encoding(s);
return;
}
break;
}
}