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x86: fix 3-operand insn reverse-matching

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The middle operand would have gone entirely unchecked, allowing e.g.

	vmovss		%xmm0, %esp, %xmm2

to assemble successfully, or e.g.

	vmovss		%xmm0, $4, %xmm2

causing an internal error. Alongside dealing with this also drop a
related comment, which hasn't been applicable anymore since the
introduction of 3-operand patterns with D set (and which perhaps never
had been logical to be there, as reverse-matched insns don't make it
there in the first place).
This commit is contained in:
Jan Beulich
2022-07-06 15:39:03 +02:00
parent ad349f2493
commit c975cec5ff
3 changed files with 19 additions and 18 deletions
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6
gas/config/tc-i386.c
View File

@ -6724,8 +6724,12 @@ match_template (char mnem_suffix)
/* Try reversing direction of operands. */
overlap0 = operand_type_and (i.types[0], operand_types[i.operands - 1]);
overlap1 = operand_type_and (i.types[i.operands - 1], operand_types[0]);
overlap2 = operand_type_and (i.types[1], operand_types[1]);
gas_assert (t->operands != 3 || !check_register);
if (!operand_type_match (overlap0, i.types[0])
|| !operand_type_match (overlap1, i.types[i.operands - 1])
|| (t->operands == 3
&& !operand_type_match (overlap2, i.types[1]))
|| (check_register
&& !operand_type_register_match (i.types[0],
operand_types[i.operands - 1],
@ -6797,8 +6801,6 @@ match_template (char mnem_suffix)
continue;
/* Fall through. */
case 3:
/* Here we make use of the fact that there are no
reverse match 3 operand instructions. */
if (!operand_type_match (overlap2, i.types[2])
|| ((check_register & 5) == 5
&& !operand_type_register_match (i.types[0],

25
gas/testsuite/gas/i386/inval-avx.l
View File

@ -2,20 +2,13 @@
.*:4: Error: .*
.*:5: Error: .*
.*:6: Error: .*
.*:9: Error:.* ambiguous .* `vcvtpd2dq'
.*:10: Error:.* ambiguous .* `vcvtpd2ps'
.*:11: Error:.* ambiguous .* `vcvttpd2dq'
.*:8: Error: .*
.*:9: Error: .*
.*:10: Error: .*
.*:11: Error: .*
.*:12: Error: .*
.*:15: Error:.* ambiguous .* `vcvtpd2dq'
.*:16: Error:.* ambiguous .* `vcvtpd2ps'
.*:17: Error:.* ambiguous .* `vcvttpd2dq'
GAS LISTING .*
[ ]*1[ ]+\# Check illegal AVX instructions
[ ]*2[ ]+\.text
[ ]*3[ ]+_start:
[ ]*4[ ]+vcvtpd2dq \(%ecx\),%xmm2
[ ]*5[ ]+vcvtpd2ps \(%ecx\),%xmm2
[ ]*6[ ]+vcvttpd2dq \(%ecx\),%xmm2
[ ]*7[ ]+
[ ]*8[ ]+\.intel_syntax noprefix
[ ]*9[ ]+vcvtpd2dq xmm2,\[ecx\]
[ ]*10[ ]+vcvtpd2ps xmm2,\[ecx\]
[ ]*11[ ]+vcvttpd2dq xmm2,\[ecx\]
#pass

6
gas/testsuite/gas/i386/inval-avx.s
View File

@ -5,6 +5,12 @@ _start:
vcvtpd2ps (%ecx),%xmm2
vcvttpd2dq (%ecx),%xmm2
vmovss %xmm0, (%esp), %xmm2
vmovss %xmm0, $4, %xmm2
vmovss %xmm0, %cr0, %xmm2
vmovss %xmm0, %ymm4, %xmm2
vmovss %xmm0, %mm4, %xmm2
.intel_syntax noprefix
vcvtpd2dq xmm2,[ecx]
vcvtpd2ps xmm2,[ecx]