[PATCH] D56131: [AArch64] Implement the .arch_extension directive
Martin Storsjö via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Dec 28 05:45:23 PST 2018
mstorsjo created this revision.
mstorsjo added reviewers: compnerd, peter.smith, echristo, sdesmalen.
Herald added subscribers: kristof.beyls, javed.absar.
Repository:
rL LLVM
https://reviews.llvm.org/D56131
Files:
lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
test/MC/AArch64/directive-arch_extension-nosimd.s
test/MC/AArch64/directive-arch_extension-simd.s
Index: test/MC/AArch64/directive-arch_extension-simd.s
===================================================================
--- /dev/null
+++ test/MC/AArch64/directive-arch_extension-simd.s
@@ -0,0 +1,6 @@
+// RUN: llvm-mc -triple aarch64 -mattr=-simd -filetype asm -o - %s | FileCheck %s
+
+ .arch_extension simd
+
+ add v0.8b, v0.8b, v0.8b
+// CHECK: add v0.8b, v0.8b, v0.8b
Index: test/MC/AArch64/directive-arch_extension-nosimd.s
===================================================================
--- /dev/null
+++ test/MC/AArch64/directive-arch_extension-nosimd.s
@@ -0,0 +1,6 @@
+// RUN: not llvm-mc -triple aarch64 -filetype asm -o - %s 2>&1 | FileCheck %s
+
+ .arch_extension nosimd
+
+ add v0.8b, v0.8b, v0.8b
+// CHECK: error: instruction requires: neon
Index: lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
===================================================================
--- lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
+++ lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
@@ -165,6 +165,7 @@
OperandVector &Operands);
bool parseDirectiveArch(SMLoc L);
+ bool parseDirectiveArchExtension(SMLoc L);
bool parseDirectiveCPU(SMLoc L);
bool parseDirectiveInst(SMLoc L);
@@ -5031,6 +5032,8 @@
parseDirectiveInst(Loc);
else if (IDVal == ".cfi_negate_ra_state")
parseDirectiveCFINegateRAState();
+ else if (IDVal == ".arch_extension")
+ parseDirectiveArchExtension(Loc);
else if (IsMachO) {
if (IDVal == MCLOHDirectiveName())
parseDirectiveLOH(IDVal, Loc);
@@ -5151,6 +5154,49 @@
return false;
}
+/// parseDirectiveArchExtension
+/// ::= .arch_extension [no]feature
+bool AArch64AsmParser::parseDirectiveArchExtension(SMLoc L) {
+ MCAsmParser &Parser = getParser();
+
+ if (getLexer().isNot(AsmToken::Identifier))
+ return Error(getLexer().getLoc(), "expected architecture extension name");
+
+ StringRef Name = Parser.getTok().getString();
+ SMLoc ExtLoc = Parser.getTok().getLoc();
+ Lex();
+
+ if (parseToken(AsmToken::EndOfStatement,
+ "unexpected token in '.arch_extension' directive"))
+ return true;
+
+ bool EnableFeature = true;
+ if (Name.startswith_lower("no")) {
+ EnableFeature = false;
+ Name = Name.substr(2);
+ }
+
+ MCSubtargetInfo &STI = copySTI();
+ FeatureBitset Features = STI.getFeatureBits();
+ for (const auto &Extension : ExtensionMap) {
+ if (Extension.Name != Name)
+ continue;
+
+ if (Extension.Features.none())
+ return Error(ExtLoc, "unsupported architectural extension: " + Name);
+
+ FeatureBitset ToggleFeatures = EnableFeature
+ ? (~Features & Extension.Features)
+ : (Features & Extension.Features);
+ uint64_t Features =
+ ComputeAvailableFeatures(STI.ToggleFeature(ToggleFeatures));
+ setAvailableFeatures(Features);
+ return false;
+ }
+
+ return Error(ExtLoc, "unknown architectural extension: " + Name);
+}
+
static SMLoc incrementLoc(SMLoc L, int Offset) {
return SMLoc::getFromPointer(L.getPointer() + Offset);
}
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