[WebAssembly] Added default stack-only instruction mode for MC.
Summary:
Made it convert from register to stack based instructions, and removed the registers.
Fixes to related code that was expecting register based instructions.
Added the correct testing flag to all tests, depending on what the
format they were expecting so far.
Translated one test to stack format as example: reg-stackify-stack.ll
tested:
llvm-lit -v `find test -name WebAssembly`
unittests/MC/*
Reviewers: dschuff, sunfish
Subscribers: sbc100, jgravelle-google, eraman, aheejin, llvm-commits, jfb
Differential Revision: https://reviews.llvm.org/D51241
llvm-svn: 340750
diff --git a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCCodeEmitter.cpp b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCCodeEmitter.cpp
index bff074d..3f24f93 100644
--- a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCCodeEmitter.cpp
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCCodeEmitter.cpp
@@ -72,8 +72,11 @@
}
// For br_table instructions, encode the size of the table. In the MCInst,
- // there's an index operand, one operand for each table entry, and the
- // default operand.
+ // there's an index operand (if not a stack instruction), one operand for
+ // each table entry, and the default operand.
+ if (MI.getOpcode() == WebAssembly::BR_TABLE_I32_S ||
+ MI.getOpcode() == WebAssembly::BR_TABLE_I64_S)
+ encodeULEB128(MI.getNumOperands() - 1, OS);
if (MI.getOpcode() == WebAssembly::BR_TABLE_I32 ||
MI.getOpcode() == WebAssembly::BR_TABLE_I64)
encodeULEB128(MI.getNumOperands() - 2, OS);