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x86: adjust segment override prefix emission 

Since we already suppress the prefix altogether when it's the default
one for the chosen addressing mode, let's do so also when instruction
prefix and override specified with the memory operand match. (Note that
insn prefix specified segment overrides never get discarded.)
This commit is contained in:
Jan Beulich 2020-02-14 14:04:23 +01:00
parent 92334ad2c6
commit b677388436
4 changed files with 29 additions and 6 deletions
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8
gas/ChangeLog
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@ -1,3 +1,11 @@
2020-02-14 Jan Beulich <jbeulich@suse.com>
* config/tc-i386.c (process_operands): Also skip segment
override prefix emission if it matches an already present one.
* testsuite/gas/i386/prefix32.s: Add double segment override
cases.
* testsuite/gas/i386/prefix32.l: Adjust expectations.
2020-02-14 Jan Beulich <jbeulich@suse.com>
* config/tc-i386.c (process_operands): Drop ineffectual segment

12
gas/config/tc-i386.c
View File

@ -7178,11 +7178,13 @@ duplicate:
}
/* If a segment was explicitly specified, and the specified segment
is not the default, use an opcode prefix to select it. If we
never figured out what the default segment is, then default_seg
will be zero at this point, and the specified segment prefix will
always be used. */
if ((i.seg[0]) && (i.seg[0] != default_seg))
is neither the default nor the one already recorded from a prefix,
use an opcode prefix to select it. If we never figured out what
the default segment is, then default_seg will be zero at this
point, and the specified segment prefix will always be used. */
if (i.seg[0]
&& i.seg[0] != default_seg
&& i.seg[0]->seg_prefix != i.prefix[SEG_PREFIX])
{
if (!add_prefix (i.seg[0]->seg_prefix))
return 0;

9
gas/testsuite/gas/i386/prefix32.l
View File

@ -8,6 +8,7 @@
.*:19: Error: same type of prefix .*
.*:20: Error: data size .* `vaddps'
.*:21: Error: data size .* `vaddpd'
.*:25: Error: same type of prefix .*
GAS LISTING .*
#...
[ ]*1[ ]+\.text
@ -33,4 +34,10 @@ GAS LISTING .*
[ ]*20[ ]+data16 vaddps %xmm0, %xmm0, %xmm0
[ ]*21[ ]+data16 vaddpd %xmm0, %xmm0, %xmm0
[ ]*22[ ]*
[ ]*23[ ]*[\?]+ 0+[ \t]+\.p2align 4,0
[ ]*23[ ]+\.Lsegment:
[ ]*24[ ]+\?\?\?\? 368B4500[ ]+ss mov %ss:\(%ebp\), %eax
[ ]*25[ ]+ss mov %ds:\(%ebp\), %eax
[ ]*26[ ]+\?\?\?\? 3E8B4500[ ]+ds mov %ss:\(%ebp\), %eax
[ ]*27[ ]+\?\?\?\? 3E8B4500[ ]+ds mov %ds:\(%ebp\), %eax
[ ]*28[ ]*
#pass

6
gas/testsuite/gas/i386/prefix32.s
View File

@ -20,4 +20,10 @@ prefix:
data16 vaddps %xmm0, %xmm0, %xmm0
data16 vaddpd %xmm0, %xmm0, %xmm0
.Lsegment:
ss mov %ss:(%ebp), %eax
ss mov %ds:(%ebp), %eax
ds mov %ss:(%ebp), %eax
ds mov %ds:(%ebp), %eax
.p2align 4,0