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[AArch64][v8.3a] Add LDRA '[xN]!' alias. 

The instruction definition has been retroactively expanded to
allow for an alias for '[xN, 0]!' as '[xN]!'.
That wouldn't make sense on LDR, but does for LDRA.
This commit is contained in:
Ahmed Bougacha 2019-06-25 18:38:20 -07:00
parent 142cbe73e9
commit 643ac6c042
3 changed files with 25 additions and 8 deletions
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3
llvm/lib/Target/AArch64/AArch64InstrFormats.td
View File

@ -1463,6 +1463,9 @@ multiclass AuthLoad<bit M, string asm, Operand opr> {
def : InstAlias<asm # "\t$Rt, [$Rn]", def : InstAlias<asm # "\t$Rt, [$Rn]",
(!cast<Instruction>(NAME # "indexed") GPR64:$Rt, GPR64sp:$Rn, 0)>; (!cast<Instruction>(NAME # "indexed") GPR64:$Rt, GPR64sp:$Rn, 0)>;
def : InstAlias<asm # "\t$Rt, [$wback]!",
(!cast<Instruction>(NAME # "writeback") GPR64sp:$wback, GPR64:$Rt, 0)>;
} }
//--- //---

8
llvm/test/MC/AArch64/armv8.3a-signed-pointer.s
View File

@ -306,3 +306,11 @@
// CHECK-NEXT: ldrab x0, [x1] // encoding: [0x20,0x04,0xa0,0xf8] // CHECK-NEXT: ldrab x0, [x1] // encoding: [0x20,0x04,0xa0,0xf8]
// CHECK-REQ: error: instruction requires: pa // CHECK-REQ: error: instruction requires: pa
// CHECK-REQ-NEXT: ldrab x0, [x1] // CHECK-REQ-NEXT: ldrab x0, [x1]
ldraa x0, [x1]!
// CHECK-NEXT: ldraa x0, [x1]! // encoding: [0x20,0x0c,0x20,0xf8]
// CHECK-REQ: error: instruction requires: pa
// CHECK-REQ-NEXT: ldraa x0, [x1]!
ldrab x0, [x1]!
// CHECK-NEXT: ldrab x0, [x1]! // encoding: [0x20,0x0c,0xa0,0xf8]
// CHECK-REQ: error: instruction requires: pa
// CHECK-REQ-NEXT: ldrab x0, [x1]!

22
llvm/test/MC/Disassembler/AArch64/armv8.3a-signed-pointer.txt
View File

@ -83,14 +83,6 @@
# CHECK: retab # CHECK: retab
# CHECK: eretaa # CHECK: eretaa
# CHECK: eretab # CHECK: eretab
# CHECK: ldraa x0, [x1, #4088]
# CHECK: ldraa x0, [x1, #-4096]
# CHECK: ldrab x0, [x1, #4088]
# CHECK: ldrab x0, [x1, #-4096]
# CHECK: ldraa x0, [x1, #4088]!
# CHECK: ldraa x0, [x1, #-4096]!
# CHECK: ldrab x0, [x1, #4088]!
# CHECK: ldrab x0, [x1, #-4096]!
[0x1f,0x08,0x1f,0xd6] [0x1f,0x08,0x1f,0xd6]
[0x1f,0x0c,0x1f,0xd6] [0x1f,0x0c,0x1f,0xd6]
[0x1f,0x08,0x3f,0xd6] [0x1f,0x08,0x3f,0xd6]
@ -99,6 +91,15 @@
[0xff,0x0f,0x5f,0xd6] [0xff,0x0f,0x5f,0xd6]
[0xff,0x0b,0x9f,0xd6] [0xff,0x0b,0x9f,0xd6]
[0xff,0x0f,0x9f,0xd6] [0xff,0x0f,0x9f,0xd6]
# CHECK: ldraa x0, [x1, #4088]
# CHECK: ldraa x0, [x1, #-4096]
# CHECK: ldrab x0, [x1, #4088]
# CHECK: ldrab x0, [x1, #-4096]
# CHECK: ldraa x0, [x1, #4088]!
# CHECK: ldraa x0, [x1, #-4096]!
# CHECK: ldrab x0, [x1, #4088]!
# CHECK: ldrab x0, [x1, #-4096]!
[0x20,0xf4,0x3f,0xf8] [0x20,0xf4,0x3f,0xf8]
[0x20,0x04,0x60,0xf8] [0x20,0x04,0x60,0xf8]
[0x20,0xf4,0xbf,0xf8] [0x20,0xf4,0xbf,0xf8]
@ -112,3 +113,8 @@
# CHECK: ldrab x0, [x1] # CHECK: ldrab x0, [x1]
[0x20,0x04,0x20,0xf8] [0x20,0x04,0x20,0xf8]
[0x20,0x04,0xa0,0xf8] [0x20,0x04,0xa0,0xf8]
# CHECK: ldraa x0, [x1]!
# CHECK: ldrab x0, [x1]!
[0x20,0x0c,0x20,0xf8]
[0x20,0x0c,0xa0,0xf8]