Summary:
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'
test.
Reviewers: rafael, dsanders
Reviewed By: dsanders
Subscribers: zoran.jovanovic, llvm-commits
Differential Revision: http://reviews.llvm.org/D4267
llvm-svn: 212603
cl::opt<int> DwarfVersion("dwarf-version", cl::desc("Dwarf version"),
cl::init(0));
+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;
}