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ARM: permit bare dmb/dsb/isb aliases on Cortex-M0

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Cortex-M0 supports these 32-bit instructions despite being Thumb1 only
(mostly). We knew about that but not that the aliases without the default "sy"
operand were also permitted.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194094 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover 2013-11-05 21:36:02 +00:00
parent 5f5095e3dc
commit f635ab8eab
2 changed files with 34 additions and 4 deletions
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6
lib/Target/ARM/ARMInstrThumb2.td
View File

@ -4329,9 +4329,9 @@ def : t2InstAlias<"tst${p} $Rn, $Rm",
(t2TSTrr GPRnopc:$Rn, rGPR:$Rm, pred:$p)>;
// Memory barriers
def : InstAlias<"dmb${p}", (t2DMB 0xf, pred:$p)>, Requires<[IsThumb2, HasDB]>;
def : InstAlias<"dsb${p}", (t2DSB 0xf, pred:$p)>, Requires<[IsThumb2, HasDB]>;
def : InstAlias<"isb${p}", (t2ISB 0xf, pred:$p)>, Requires<[IsThumb2, HasDB]>;
def : InstAlias<"dmb${p}", (t2DMB 0xf, pred:$p)>, Requires<[HasDB]>;
def : InstAlias<"dsb${p}", (t2DSB 0xf, pred:$p)>, Requires<[HasDB]>;
def : InstAlias<"isb${p}", (t2ISB 0xf, pred:$p)>, Requires<[HasDB]>;
// Alias for LDR, LDRB, LDRH, LDRSB, and LDRSH without the ".w" optional
// width specifier.

32
test/MC/ARM/thumb-hints.s
View File

@ -17,9 +17,21 @@
@ CHECK: wfi @ encoding: [0x30,0xbf]
@ CHECK: sev @ encoding: [0x40,0xbf]
@ CHECK-EVIL-PRE-UAL: mov r8, r8 @ encoding: [0xc0,0x46]
dmb sy
dmb
dsb sy
dsb
isb sy
isb
@ CHECK: dmb sy @ encoding: [0xbf,0xf3,0x5f,0x8f]
@ CHECK: dmb sy @ encoding: [0xbf,0xf3,0x5f,0x8f]
@ CHECK: dsb sy @ encoding: [0xbf,0xf3,0x4f,0x8f]
@ CHECK: dsb sy @ encoding: [0xbf,0xf3,0x4f,0x8f]
@ CHECK: isb sy @ encoding: [0xbf,0xf3,0x6f,0x8f]
@ CHECK: isb sy @ encoding: [0xbf,0xf3,0x6f,0x8f]
@ CHECK-ERROR: error: instruction requires: armv6m or armv6t2
@ CHECK-ERROR-NEXT: yield
@ -32,3 +44,21 @@
@ CHECK-ERROR: error: instruction requires: armv6m or armv6t2
@ CHECK-ERROR-NEXT: sev
@ CHECK-ERROR: error:
@ CHECK-ERROR-NEXT: dmb sy
@ CHECK-ERROR: error: instruction requires: data-barriers
@ CHECK-ERROR-NEXT: dmb
@ CHECK-ERROR: error:
@ CHECK-ERROR-NEXT: dsb sy
@ CHECK-ERROR: error: instruction requires: data-barriers
@ CHECK-ERROR-NEXT: dsb
@ CHECK-ERROR: error:
@ CHECK-ERROR-NEXT: isb sy
@ CHECK-ERROR: error: instruction requires: data-barriers
@ CHECK-ERROR-NEXT: isb