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[ARM] Warn on deprecated IT blocks in v8 AArch32 assembly.

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Patch by Artyom Skrobov.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191885 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Amara Emerson
2013-10-03 09:31:51 +00:00
parent 9d08d69fd4
commit 6eef361b73
9 changed files with 9888 additions and 92 deletions
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23
lib/Target/ARM/AsmParser/ARMAsmParser.cpp
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@@ -7,6 +7,7 @@
//
//===----------------------------------------------------------------------===//
#include "ARMFeatures.h"
#include "llvm/MC/MCTargetAsmParser.h"
#include "MCTargetDesc/ARMAddressingModes.h"
#include "MCTargetDesc/ARMBaseInfo.h"
@@ -7622,12 +7623,22 @@ MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
return true;
}
// Some instructions need post-processing to, for example, tweak which
// encoding is selected. Loop on it while changes happen so the
// individual transformations can chain off each other. E.g.,
// tPOP(r8)->t2LDMIA_UPD(sp,r8)->t2STR_POST(sp,r8)
while (processInstruction(Inst, Operands))
;
{ // processInstruction() updates inITBlock state, we need to save it away
bool wasInITBlock = inITBlock();
// Some instructions need post-processing to, for example, tweak which
// encoding is selected. Loop on it while changes happen so the
// individual transformations can chain off each other. E.g.,
// tPOP(r8)->t2LDMIA_UPD(sp,r8)->t2STR_POST(sp,r8)
while (processInstruction(Inst, Operands))
;
// Only after the instruction is fully processed, we can validate it
if (wasInITBlock && hasV8Ops() && isThumb() &&
!isV8EligibleForIT(&Inst, 2)) {
Warning(IDLoc, "deprecated instruction in IT block");
}
}
// Only move forward at the very end so that everything in validate
// and process gets a consistent answer about whether we're in an IT