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MCAsmParser: support .ifne

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The .ifne directive assembles the following section of code if the argument
expression is non-zero.  Effectively, it is equivalent to if.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201986 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool 2014-02-23 15:53:41 +00:00
parent 0922e5b643
commit 69f706d9e1
2 changed files with 16 additions and 3 deletions
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10
lib/MC/MCParser/AsmParser.cpp
View File

@ -350,8 +350,8 @@ private:
DK_REFERENCE, DK_WEAK_DEFINITION, DK_WEAK_REFERENCE,
DK_WEAK_DEF_CAN_BE_HIDDEN, DK_COMM, DK_COMMON, DK_LCOMM, DK_ABORT,
DK_INCLUDE, DK_INCBIN, DK_CODE16, DK_CODE16GCC, DK_REPT, DK_IRP, DK_IRPC,
DK_IF, DK_IFB, DK_IFNB, DK_IFC, DK_IFNC, DK_IFDEF, DK_IFNDEF, DK_IFNOTDEF,
DK_ELSEIF, DK_ELSE, DK_ENDIF,
DK_IF, DK_IFNE, DK_IFB, DK_IFNB, DK_IFC, DK_IFNC, DK_IFDEF, DK_IFNDEF,
DK_IFNOTDEF, DK_ELSEIF, DK_ELSE, DK_ENDIF,
DK_SPACE, DK_SKIP, DK_FILE, DK_LINE, DK_LOC, DK_STABS,
DK_CFI_SECTIONS, DK_CFI_STARTPROC, DK_CFI_ENDPROC, DK_CFI_DEF_CFA,
DK_CFI_DEF_CFA_OFFSET, DK_CFI_ADJUST_CFA_OFFSET, DK_CFI_DEF_CFA_REGISTER,
@ -438,7 +438,8 @@ private:
bool parseDirectiveInclude(); // ".include"
bool parseDirectiveIncbin(); // ".incbin"
bool parseDirectiveIf(SMLoc DirectiveLoc); // ".if"
// ".if" or ".ifne"
bool parseDirectiveIf(SMLoc DirectiveLoc);
// ".ifb" or ".ifnb", depending on ExpectBlank.
bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank);
// ".ifc" or ".ifnc", depending on ExpectEqual.
@ -1230,6 +1231,7 @@ bool AsmParser::parseStatement(ParseStatementInfo &Info) {
default:
break;
case DK_IF:
case DK_IFNE:
return parseDirectiveIf(IDLoc);
case DK_IFB:
return parseDirectiveIfb(IDLoc, true);
@ -3766,6 +3768,7 @@ bool AsmParser::parseDirectiveIncbin() {
/// parseDirectiveIf
/// ::= .if expression
/// ::= .ifne expression
bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc) {
TheCondStack.push_back(TheCondState);
TheCondState.TheCond = AsmCond::IfCond;
@ -4025,6 +4028,7 @@ void AsmParser::initializeDirectiveKindMap() {
DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK;
DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK;
DirectiveKindMap[".if"] = DK_IF;
DirectiveKindMap[".ifne"] = DK_IFNE;
DirectiveKindMap[".ifb"] = DK_IFB;
DirectiveKindMap[".ifnb"] = DK_IFNB;
DirectiveKindMap[".ifc"] = DK_IFC;

9
test/MC/AsmParser/conditional_asm.s
View File

@ -10,3 +10,12 @@
.byte 0
.endif
.endif
# CHECK: .byte 1
# CHECK-NOT: .byte 0
.ifne 32 - 32
.byte 0
.else
.byte 1
.endif