[AArch64] Inline callee if its target-features are a subset of the caller
Summary:
Similar to X86, it should be safe to inline callees if their target-features
are a subset of the caller. This change matches GCC's inlining behavior
with respect to attributes [1].
[1] https://gcc.gnu.org/onlinedocs/gcc/AArch64-Function-Attributes.html#AArch64-Function-Attributes
Reviewers: kristof.beyls, javed.absar, rengolin, t.p.northover
Reviewed By: t.p.northover
Subscribers: aemerson, eraman, llvm-commits
Differential Revision: https://reviews.llvm.org/D34698
llvm-svn: 306478
diff --git a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
index a432868..1d0f0b9 100644
--- a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
@@ -20,6 +20,20 @@
#define DEBUG_TYPE "aarch64tti"
+bool AArch64TTIImpl::areInlineCompatible(const Function *Caller,
+ const Function *Callee) const {
+ const TargetMachine &TM = getTLI()->getTargetMachine();
+
+ const FeatureBitset &CallerBits =
+ TM.getSubtargetImpl(*Caller)->getFeatureBits();
+ const FeatureBitset &CalleeBits =
+ TM.getSubtargetImpl(*Callee)->getFeatureBits();
+
+ // Inline a callee if its target-features are a subset of the callers
+ // target-features.
+ return (CallerBits & CalleeBits) == CalleeBits;
+}
+
/// \brief Calculate the cost of materializing a 64-bit value. This helper
/// method might only calculate a fraction of a larger immediate. Therefore it
/// is valid to return a cost of ZERO.