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[Thumb2] BXJ should be undefined for v7M, v8A 

The Thumb2 BXJ instruction (Branch and Exchange Jazelle) is not
defined for v7M or v8A. It is defined for all other Thumb2-supporting
architectures (v6T2, v7A and v7R).

llvm-svn: 218445
This commit is contained in:
Oliver Stannard 2014-09-25 10:02:05 +00:00
parent bc4ce3a224
commit 3256b26ef2
2 changed files with 11 additions and 1 deletions
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2
llvm/lib/Target/ARM/ARMInstrThumb2.td
View File

@ -3632,7 +3632,7 @@ def t2IT : Thumb2XI<(outs), (ins it_pred:$cc, it_mask:$mask),
// Branch and Exchange Jazelle -- for disassembly only
// Rm = Inst{19-16}
def t2BXJ : T2I<(outs), (ins rGPR:$func), NoItinerary, "bxj", "\t$func", []>,
Sched<[WriteBr]> {
Sched<[WriteBr]>, Requires<[IsThumb2, IsNotMClass, PreV8]> {
bits<4> func;
let Inst{31-27} = 0b11110;
let Inst{26} = 0;

10
llvm/test/MC/ARM/thumb2-bxj.s Normal file
View File

@ -0,0 +1,10 @@
@ RUN: llvm-mc -triple=thumbv6t2--none-eabi -show-encoding < %s | FileCheck %s
@ RUN: llvm-mc -triple=thumbv7a--none-eabi -show-encoding < %s | FileCheck %s
@ RUN: llvm-mc -triple=thumbv7r--none-eabi -show-encoding < %s | FileCheck %s
@ RUN: not llvm-mc -triple=thumbv7m--none-eabi -show-encoding < %s 2>&1 | FileCheck %s --check-prefix=UNDEF
@ RUN: not llvm-mc -triple=thumbv8a--none-eabi -show-encoding < %s 2>&1 | FileCheck %s --check-prefix=UNDEF
bxj r2
@ CHECK: bxj r2 @ encoding: [0xc2,0xf3,0x00,0x8f]
@ UNDEF: error: instruction requires: arm-mode