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| author | Jan Beulich <jbeulich@suse.com> | 2021-03-29 12:03:31 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2021-03-29 12:03:31 +0200 |
| commit | 9df6f676c2c7280dc0c419c43927a07c6359814d (patch) | |
| tree | ebc12d8d2d39793ca514b4f004494a17c5a6710f /opcodes/ChangeLog | |
| parent | 389d00a5e5b1fa6fcd9eda747b17ef73f58eb693 (diff) | |
| download | gdb-9df6f676c2c7280dc0c419c43927a07c6359814d.zip gdb-9df6f676c2c7280dc0c419c43927a07c6359814d.tar.gz gdb-9df6f676c2c7280dc0c419c43927a07c6359814d.tar.bz2 | |
x86: shrink some struct insn_template fields
Now that all base opcodes are only at most 2 bytes in size, shrink its
template field to just as much. By also shrinking extension_opcode and
operands to just what they really need, we can free up an entire 32-bit
slot (plus 4 left bits past the bitfields themselves).
At present this alters sizeof(struct insn_template) only for 32-bit
builds. In 64-bit builds it instead leaves a padding hole that will
allow to buffer future growth of other fields (opcode_modifier,
cpu_flags, operand_types[]).
Diffstat (limited to 'opcodes/ChangeLog')
| -rw-r--r-- | opcodes/ChangeLog | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog index 82a1c5c..ff0ecf3 100644 --- a/opcodes/ChangeLog +++ b/opcodes/ChangeLog @@ -1,5 +1,11 @@ 2021-03-29 Jan Beulich <jbeulich@suse.com> + * i386-opc.h (struct insn_template): Shrink base_opcode to 16 + bits. Shrink extension_opcode to 9 bits. Make it signed. Change + value of None. Shrink operands to 3 bits. + +2021-03-29 Jan Beulich <jbeulich@suse.com> + * i386-gen.c (process_i386_opcode_modifier): New parameter "space". (output_i386_opcode): New local variable "space". Adjust |