[RISCV] Change function alignment to 4 bytes, and 2 bytes for RVC

Summary:

According RISC-V ELF psABI specification, base RV32 and RV64 ISAs only
allow 32-bit instruction alignment, but instruction allow to be aligned
to 16-bit boundaries for C-extension.

So we just align to 4 bytes and 2 bytes for C-extension is enough.

Reviewers: asb, apazos

Differential Revision: https://reviews.llvm.org/D45560

Patch by Kito Cheng.

llvm-svn: 329899

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index 8e9ab54bf00..0018a9c750f 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -142,8 +142,9 @@ RISCVTargetLowering::RISCVTargetLowering(const TargetMachine &TM,
   setBooleanContents(ZeroOrOneBooleanContent);
 
   // Function alignments (log2).
-  setMinFunctionAlignment(3);
-  setPrefFunctionAlignment(3);
+  unsigned FunctionAlignment = Subtarget.hasStdExtC() ? 1 : 2;
+  setMinFunctionAlignment(FunctionAlignment);
+  setPrefFunctionAlignment(FunctionAlignment);
 
   // Effectively disable jump table generation.
   setMinimumJumpTableEntries(INT_MAX);