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[X86] Add assembler support for .d32 and .d8 mnemonic suffixes to control displacement size.

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This is an older syntax than the {disp32} and {disp8} pseudo
prefixes that were added a few weeks ago. We can reuse most of
the support for that to support .d32 and .d8 as well.
This commit is contained in:
Craig Topper 2020-08-26 10:41:51 -07:00
parent b6a0e78067
commit 452ef84095
4 changed files with 24 additions and 0 deletions
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3
docs/ReleaseNotes.rst
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@ -98,6 +98,9 @@ During this release ...
frontend in 10.0. Mention of the 'mpx' feature in an IR file will print a
message to stderr, but IR should still compile.
* Support for -march=sapphirerapids was added.
* The assembler now has support for {disp32} and {disp8} pseudo prefixes for
controlling displacement size for memory operands and jump displacements. The
assembler also supports the .d32 and .d8 mnemonic suffixes to do the same.
Changes to the AMDGPU Target
-----------------------------

7
lib/Target/X86/AsmParser/X86AsmParser.cpp
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@ -2670,6 +2670,13 @@ bool X86AsmParser::ParseInstruction(ParseInstructionInfo &Info, StringRef Name,
break;
}
// Support the suffix syntax for overriding displacement size as well.
if (Name.consume_back(".d32")) {
ForcedDispEncoding = DispEncoding_Disp32;
} else if (Name.consume_back(".d8")) {
ForcedDispEncoding = DispEncoding_Disp8;
}
StringRef PatchedName = Name;
// Hack to skip "short" following Jcc.

8
test/MC/X86/x86-32.s
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@ -1110,16 +1110,24 @@ ptwritel 0xdeadbeef(%ebx,%ecx,8)
// CHECK: encoding: [0xf3,0x0f,0xae,0xe0]
ptwritel %eax
// CHECK: jmp foo
// CHECK: encoding: [0xe9,A,A,A,A]
// CHECK: fixup A - offset: 1, value: foo-4, kind: FK_PCRel_4
// CHECK: jmp foo
// CHECK: encoding: [0xe9,A,A,A,A]
// CHECK: fixup A - offset: 1, value: foo-4, kind: FK_PCRel_4
{disp32} jmp foo
jmp.d32 foo
foo:
// CHECK: je foo
// CHECK: encoding: [0x0f,0x84,A,A,A,A]
// CHECK: fixup A - offset: 2, value: foo-4, kind: FK_PCRel_4
// CHECK: je foo
// CHECK: encoding: [0x0f,0x84,A,A,A,A]
// CHECK: fixup A - offset: 2, value: foo-4, kind: FK_PCRel_4
{disp32} je foo
je.d32 foo
// CHECK: ljmpl *%cs:305419896
// CHECK: encoding: [0x2e,0xff,0x2d,0x78,0x56,0x34,0x12]

6
test/MC/X86/x86-64.s
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@ -1912,9 +1912,15 @@ ud2b (%rbx), %rcx
// CHECK: encoding: [0xc7,0x40,0x00,0x01,0x00,0x00,0x00]
// CHECK: movl $1, (%rax)
// CHECK: encoding: [0xc7,0x80,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00]
// CHECK: movl $1, (%rax)
// CHECK: encoding: [0xc7,0x40,0x00,0x01,0x00,0x00,0x00]
// CHECK: movl $1, (%rax)
// CHECK: encoding: [0xc7,0x80,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00]
movl $1, (%rax)
{disp8} movl $1, (%rax)
{disp32} movl $1, (%rax)
movl.d8 $1, (%rax)
movl.d32 $1, (%rax)
// Requires disp8 by default
// CHECK: movl $1, (%rbp)