Add a note to RISCVUsage

wangpc-pp · wangpc-pp · commit ef4e45f16ba0 · 2024-01-08T11:07:47.000+08:00
diff --git a/llvm/docs/RISCVUsage.rst b/llvm/docs/RISCVUsage.rst
@@ -183,7 +183,7 @@ Supported
 .. _riscv-rve-note:
 
 ``E``
-  Support of RV32E/RV64E and ilp32e/lp64e ABIs are experimental.
+  Support of RV32E/RV64E and ilp32e/lp64e ABIs are experimental. To be compatible with the implementation of ilp32e in GCC, we don't use aligned registers to pass variadic arguments and set stack alignment to 4-bytes for types with length of 2*XLEN.
 
 .. _riscv-scalar-crypto-note1:
 
