[llvm] r212603 - Add ability to emit internal instruction representation to CodeGen assembly output.

Daniel Sanders daniel.sanders at imgtec.com
Wed Jul 9 03:07:36 PDT 2014

Author: dsanders
Date: Wed Jul  9 05:07:36 2014
New Revision: 212603

URL: http://llvm.org/viewvc/llvm-project?rev=212603&view=rev
Add ability to emit internal instruction representation to CodeGen assembly output.

This patch re-uses the implementation of 'llvm-mc -show-inst' and makes it
available to llc as 'llc -asm-show-inst'.

This is necessary to test parts of MIPS32r6/MIPS64r6 without resorting to
'llc -filetype=obj' tests. For example, on MIPS32r2 and earlier we use the
'jr $rs' instruction for indirect branches and returns. On MIPS32r6, we no
longer have 'jr $rs' and use 'jalr $zero, $rs' instead. The catch is that,
on MIPS32r6, 'jr $rs' is an alias for 'jalr $zero, $rs' and is the preferred
way of writing this instruction. As a result, all MIPS ISA's emit 'jr $rs' in
their assembly output and the assembler encodes this to different opcodes
according to the ISA.

Using this option, we can check that the MCInst really is a JR or a JALR by
matching the emitted comment. This removes the need for a 'llc -filetype=obj'

Reviewers: rafael, dsanders

Reviewed By: dsanders

Subscribers: zoran.jovanovic, llvm-commits

Differential Revision: http://reviews.llvm.org/D4267


Modified: llvm/trunk/include/llvm/MC/MCTargetOptionsCommandFlags.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/MC/MCTargetOptionsCommandFlags.h?rev=212603&r1=212602&r2=212603&view=diff
--- llvm/trunk/include/llvm/MC/MCTargetOptionsCommandFlags.h (original)
+++ llvm/trunk/include/llvm/MC/MCTargetOptionsCommandFlags.h Wed Jul  9 05:07:36 2014
@@ -36,12 +36,17 @@ cl::opt<bool> RelaxAll("mc-relax-all",
 cl::opt<int> DwarfVersion("dwarf-version", cl::desc("Dwarf version"),
+cl::opt<bool> ShowMCInst("asm-show-inst",
+                         cl::desc("Emit internal instruction representation to "
+                                  "assembly file"));
 static inline MCTargetOptions InitMCTargetOptionsFromFlags() {
   MCTargetOptions Options;
   Options.SanitizeAddress =
       (AsmInstrumentation == MCTargetOptions::AsmInstrumentationAddress);
   Options.MCRelaxAll = RelaxAll;
   Options.DwarfVersion = DwarfVersion;
+  Options.ShowMCInst = ShowMCInst;
   return Options;

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