Thumb2 assembly parsing and encoding for SRS.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139925 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 48 insertions, 20 deletions

diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index 0eb8514eaa..21e70fa83e 100644
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -3300,32 +3300,30 @@ def t2SMC : T2I<(outs), (ins imm0_15:$opt), NoItinerary, "smc", "\t$opt",
   let Inst{19-16} = opt;
 }
 
-class T2SRS<bits<12> op31_20,
-           dag oops, dag iops, InstrItinClass itin,
-          string opc, string asm, list<dag> pattern>
+class T2SRS<bits<2> Op, bit W, dag oops, dag iops, InstrItinClass itin,
+            string opc, string asm, list<dag> pattern>
   : T2I<oops, iops, itin, opc, asm, pattern> {
-  let Inst{31-20} = op31_20{11-0};
-
   bits<5> mode;
+  let Inst{31-25} = 0b1110100;
+  let Inst{24-23} = Op;
+  let Inst{22} = 0;
+  let Inst{21} = W;
+  let Inst{20-16} = 0b01101;
+  let Inst{15-5} = 0b11000000000;
   let Inst{4-0} = mode{4-0};
 }
 
-// Store Return State is a system instruction -- for disassembly only
-def t2SRSDBW : T2SRS<0b111010000010,
-                   (outs),(ins i32imm:$mode),NoItinerary,"srsdb","\tsp!, $mode",
-                   [/* For disassembly only; pattern left blank */]>;
-def t2SRSDB  : T2SRS<0b111010000000,
-                   (outs),(ins i32imm:$mode),NoItinerary,"srsdb","\tsp, $mode",
-                   [/* For disassembly only; pattern left blank */]>;
-def t2SRSIAW : T2SRS<0b111010011010,
-                   (outs),(ins i32imm:$mode),NoItinerary,"srsia","\tsp!, $mode",
-                   [/* For disassembly only; pattern left blank */]>;
-def t2SRSIA  : T2SRS<0b111010011000,
-                   (outs), (ins i32imm:$mode),NoItinerary,"srsia","\tsp, $mode",
-                   [/* For disassembly only; pattern left blank */]>;
-
-// Return From Exception is a system instruction -- for disassembly only
+// Store Return State is a system instruction.
+def t2SRSDB_UPD : T2SRS<0b00, 1, (outs), (ins imm0_31:$mode), NoItinerary,
+                        "srsdb", "\tsp!, $mode", []>;
+def t2SRSDB  : T2SRS<0b00, 0, (outs), (ins imm0_31:$mode), NoItinerary,
+                     "srsdb","\tsp, $mode", []>;
+def t2SRSIA_UPD : T2SRS<0b11, 1, (outs), (ins imm0_31:$mode), NoItinerary,
+                        "srsia","\tsp!, $mode", []>;
+def t2SRSIA  : T2SRS<0b11, 0, (outs), (ins imm0_31:$mode), NoItinerary,
+                     "srsia","\tsp, $mode", []>;
 
+// Return From Exception is a system instruction.
 class T2RFE<bits<12> op31_20, dag oops, dag iops, InstrItinClass itin,
           string opc, string asm, list<dag> pattern>
   : T2I<oops, iops, itin, opc, asm, pattern> {
diff --git a/test/MC/ARM/basic-thumb2-instructions.s b/test/MC/ARM/basic-thumb2-instructions.s
index 88ed3b665d..e5441aea79 100644
--- a/test/MC/ARM/basic-thumb2-instructions.s
+++ b/test/MC/ARM/basic-thumb2-instructions.s
@@ -2019,6 +2019,36 @@ _func:
 
 
 @------------------------------------------------------------------------------
+@ SRS
+@------------------------------------------------------------------------------
+        srsdb sp, #1
+        srsia sp, #0
+
+        srsdb sp!, #19
+        srsia sp!, #2
+
+        srsea sp, #10
+        srsfd sp, #9
+
+        srsea sp!, #5
+        srsfd sp!, #5
+
+        srs sp, #5
+        srs sp!, #5
+
+@ CHECK: srsdb	sp, #1                  @ encoding: [0x0d,0xe8,0x01,0xc0]
+@ CHECK: srsia	sp, #0                  @ encoding: [0x8d,0xe9,0x00,0xc0]
+@ CHECK: srsdb	sp!, #19                @ encoding: [0x2d,0xe8,0x13,0xc0]
+@ CHECK: srsia	sp!, #2                 @ encoding: [0xad,0xe9,0x02,0xc0]
+@ CHECK: srsdb	sp, #10                 @ encoding: [0x0d,0xe8,0x0a,0xc0]
+@ CHECK: srsia	sp, #9                  @ encoding: [0x8d,0xe9,0x09,0xc0]
+@ CHECK: srsdb	sp!, #5                 @ encoding: [0x2d,0xe8,0x05,0xc0]
+@ CHECK: srsia	sp!, #5                 @ encoding: [0xad,0xe9,0x05,0xc0]
+@ CHECK: srsia	sp, #5                  @ encoding: [0x8d,0xe9,0x05,0xc0]
+@ CHECK: srsia	sp!, #5                 @ encoding: [0xad,0xe9,0x05,0xc0]
+
+
+@------------------------------------------------------------------------------
 @ SUB (register)
 @------------------------------------------------------------------------------
         sub.w r5, r2, r12, rrx