[RISCV] Support ABI checking with per function target-features

1. if users don't specific -mattr, the default target-feature come
from IR attribute.
2. fixed bug and re-land this patch

Reviewers: lenary, asb

Reviewed By: lenary

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70837

(cherry picked from commit 0cb274de397a193fb37c60653b336d48a3a4f1bd)

1 files changed, 13 insertions, 0 deletions

diff --git a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
index cfd83e4189f..c7efdf42a7c 100644
--- a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
+++ b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
@@ -194,6 +194,19 @@ public:
     Parser.addAliasForDirective(".word", ".4byte");
     Parser.addAliasForDirective(".dword", ".8byte");
     setAvailableFeatures(ComputeAvailableFeatures(STI.getFeatureBits()));
+
+    auto ABIName = StringRef(Options.ABIName);
+    if (ABIName.endswith("f") &&
+        !getSTI().getFeatureBits()[RISCV::FeatureStdExtF]) {
+      errs() << "Hard-float 'f' ABI can't be used for a target that "
+                "doesn't support the F instruction set extension (ignoring "
+                "target-abi)\n";
+    } else if (ABIName.endswith("d") &&
+               !getSTI().getFeatureBits()[RISCV::FeatureStdExtD]) {
+      errs() << "Hard-float 'd' ABI can't be used for a target that "
+                "doesn't support the D instruction set extension (ignoring "
+                "target-abi)\n";
+    }
   }
 };