[llvm] [RISCV][MC] Support Assembling 48- and 64-bit Instructions (PR #110022)

[Alex Bradbury via llvm-commits]

================
@@ -26,8 +26,28 @@
 
 .insn . # CHECK: :[[@LINE]]:7: error: expected instruction format or an integer constant
 .insn 0x2, # CHECK: :[[@LINE]]:12: error: expected an integer constant
-.insn 0x2, 0xffff # CHECK: :[[@LINE]]:7: error: instruction length mismatch
-.insn 0x2, 0xffffffff # CHECK: :[[@LINE]]:7: error: instruction length mismatch
-.insn 0xffffffffff # CHECK: :[[@LINE]]:7: error: invalid operand for instruction
-.insn 0x0010 # CHECK: :[[@LINE]]:7: error: compressed instructions are not allowed
+
 .insn 0x4, 0x13, 0 # CHECK: :[[@LINE]]:16: error: invalid operand for instruction
+
+.insn 0x2, 0xffff # CHECK: :[[@LINE]]:7: error: instruction length does not match the encoding
+.insn 0x2, 0xffffffff # CHECK: :[[@LINE]]:7: error: instruction length does not match the encoding
+.insn 0xffffffffff # CHECK: :[[@LINE]]:7: error: encoding value does not fit into instruction
+
+.insn 10, 0x000007f # CHECK: :[[@LINE]]:7: error: instruction lengths over 64 bits are not supported
+
+.insn 0x2, 0x03 # CHECK: :[[@LINE]]:7: error: instruction length does not match the encoding
+.insn 0x2, 0x1f # CHECK: :[[@LINE]]:7: error: instruction length does not match the encoding
+.insn 0x2, 0x3f # CHECK: :[[@LINE]]:7: error: instruction length does not match the encoding
+
+.insn 0x4, 0x00000001 # CHECK: :[[@LINE]]:7: error: instruction length does not match the encoding
+
+.insn 0x6, 0x000000000001 # CHECK: :[[@LINE]]:7: error: compressed instructions are not allowed
+.insn 0x8, 0x0000000000000001 # CHECK: :[[@LINE]]:7: error: compressed instructions are not allowed
+
+.insn 0x2, 0x10001 # CHECK: :[[@LINE]]:7: error: encoding value does not fit into instruction
+.insn 0x4, 0x100000003 # CHECK: :[[@LINE]]:7: error: encoding value does not fit into instruction
+.insn 0x6, 0x100000000001f # CHECK: :[[@LINE]]:7: error: encoding value does not fit into instruction
+.insn 0x8, 0x1000000000000003f # CHECK: :[[@LINE]]:12: error: expected an integer constant
+
+.insn 0x0010 # CHECK: :[[@LINE]]:7: error: compressed instructions are not allowed
+.insn 0x2, 0x0001 # CHECK: :[[@LINE]]:7: error: compressed instructions are not allowed
----------------
asb wrote:

I don't think you have any test coverage for specifying a length that isn't a multiple of two bytes.

https://github.com/llvm/llvm-project/pull/110022