Try to get ahead of Johnny Chen and pro-actively add some more ARM encoding

bits.  Johnny, please review -- I do not have a good track record of getting
these right.

llvm-svn: 85173

1 files changed, 16 insertions, 2 deletions

diff --git a/llvm/lib/Target/ARM/ARMInstrInfo.td b/llvm/lib/Target/ARM/ARMInstrInfo.td
index 74101c0350a..b6921759f9d 100644
--- a/llvm/lib/Target/ARM/ARMInstrInfo.td
+++ b/llvm/lib/Target/ARM/ARMInstrInfo.td
@@ -1092,6 +1092,7 @@ defm SBC : AI1_adde_sube_irs<0b0110, "sbc",
 def RSBri : AsI1<0b0011, (outs GPR:$dst), (ins GPR:$a, so_imm:$b), DPFrm,
                   IIC_iALUi, "rsb", " $dst, $a, $b",
                   [(set GPR:$dst, (sub so_imm:$b, GPR:$a))]> {
+    let Inst{20} = 0;
     let Inst{25} = 1;
 }
 
@@ -1100,6 +1101,7 @@ def RSBrs : AsI1<0b0011, (outs GPR:$dst), (ins GPR:$a, so_reg:$b), DPSoRegFrm,
                   [(set GPR:$dst, (sub so_reg:$b, GPR:$a))]> {
     let Inst{4} = 1;
     let Inst{7} = 0;
+    let Inst{20} = 0;
     let Inst{25} = 0;
 }
 
@@ -1126,12 +1128,18 @@ def RSCri : AsI1<0b0111, (outs GPR:$dst), (ins GPR:$a, so_imm:$b),
                  DPFrm, IIC_iALUi, "rsc", " $dst, $a, $b",
                  [(set GPR:$dst, (sube so_imm:$b, GPR:$a))]>,
                  Requires<[IsARM, CarryDefIsUnused]> {
+    let Inst{20} = 0;
     let Inst{25} = 1;
 }
 def RSCrs : AsI1<0b0111, (outs GPR:$dst), (ins GPR:$a, so_reg:$b),
                  DPSoRegFrm, IIC_iALUsr, "rsc", " $dst, $a, $b",
                  [(set GPR:$dst, (sube so_reg:$b, GPR:$a))]>,
-                 Requires<[IsARM, CarryDefIsUnused]>;
+                 Requires<[IsARM, CarryDefIsUnused]> {
+    let Inst{4} = 1;
+    let Inst{7} = 0;
+    let Inst{20} = 0;
+    let Inst{25} = 0;
+}
 }
 
 // FIXME: Allow these to be predicated.
@@ -1140,12 +1148,18 @@ def RSCSri : AXI1<0b0111, (outs GPR:$dst), (ins GPR:$a, so_imm:$b),
                   DPFrm, IIC_iALUi, "rscs $dst, $a, $b",
                   [(set GPR:$dst, (sube so_imm:$b, GPR:$a))]>,
                   Requires<[IsARM, CarryDefIsUnused]> {
+    let Inst{20} = 1;
     let Inst{25} = 1;
 }
 def RSCSrs : AXI1<0b0111, (outs GPR:$dst), (ins GPR:$a, so_reg:$b),
                   DPSoRegFrm, IIC_iALUsr, "rscs $dst, $a, $b",
                   [(set GPR:$dst, (sube so_reg:$b, GPR:$a))]>,
-                  Requires<[IsARM, CarryDefIsUnused]>;
+                  Requires<[IsARM, CarryDefIsUnused]> {
+    let Inst{4} = 1;
+    let Inst{7} = 0;
+    let Inst{20} = 1;
+    let Inst{25} = 0;
+}
 }
 
 // (sub X, imm) gets canonicalized to (add X, -imm).  Match this form.