From 23465a06f4f4fa098f99cf91e81ed8f26f962f3f Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Wed, 17 Nov 2010 20:35:29 +0000
Subject: [PATCH] Provide Thumb2 encodings for bitfield instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119551 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMInstrThumb2.td | 47 +++++++++++++++++++++++++++++-----------
 test/MC/ARM/thumb2.s             |  6 +++++
 2 files changed, 40 insertions(+), 13 deletions(-)

diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index ace133339e3..c560c53554d 100644
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -1989,10 +1989,30 @@ defm t2BIC  : T2I_bin_w_irs<0b0001, "bic",
                             IIC_iBITi, IIC_iBITr, IIC_iBITsi,
                             BinOpFrag<(and node:$LHS, (not node:$RHS))>>;
 
-let Constraints = "$src = $dst" in
-def t2BFC : T2I<(outs rGPR:$dst), (ins rGPR:$src, bf_inv_mask_imm:$imm),
-                IIC_iUNAsi, "bfc", "\t$dst, $imm",
-                [(set rGPR:$dst, (and rGPR:$src, bf_inv_mask_imm:$imm))]> {
+class T2BitFI<dag oops, dag iops, InstrItinClass itin,
+             string opc, string asm, list<dag> pattern>
+    : T2I<oops, iops, itin, opc, asm, pattern> { 
+  bits<4> Rd;
+  bits<10> imm;
+
+  let Inst{11-8}  = Rd{3-0};
+  let Inst{4-0}   = imm{9-5};
+  let Inst{14-12} = imm{4-2};
+  let Inst{7-6}   = imm{1-0};
+}
+
+class T2TwoRegBitFI<dag oops, dag iops, InstrItinClass itin,
+             string opc, string asm, list<dag> pattern>
+    : T2BitFI<oops, iops, itin, opc, asm, pattern> { 
+  bits<4> Rn;
+
+  let Inst{3-0} = Rn{3-0};
+}
+
+let Constraints = "$src = $Rd" in
+def t2BFC : T2BitFI<(outs rGPR:$Rd), (ins rGPR:$src, bf_inv_mask_imm:$imm),
+                IIC_iUNAsi, "bfc", "\t$Rd, $imm",
+                [(set rGPR:$Rd, (and rGPR:$src, bf_inv_mask_imm:$imm))]> {
   let Inst{31-27} = 0b11110;
   let Inst{25} = 1;
   let Inst{24-20} = 0b10110;
@@ -2000,16 +2020,17 @@ def t2BFC : T2I<(outs rGPR:$dst), (ins rGPR:$src, bf_inv_mask_imm:$imm),
   let Inst{15} = 0;
 }
 
-def t2SBFX: T2I<(outs rGPR:$dst), (ins rGPR:$src, imm0_31:$lsb, imm0_31:$width),
-                 IIC_iUNAsi, "sbfx", "\t$dst, $src, $lsb, $width", []> {
+def t2SBFX: T2TwoRegBitFI<
+                (outs rGPR:$Rd), (ins rGPR:$Rn, bf_inv_mask_imm:$imm),
+                 IIC_iUNAsi, "sbfx", "\t$Rd, $Rn, $imm", []> {
   let Inst{31-27} = 0b11110;
   let Inst{25} = 1;
   let Inst{24-20} = 0b10100;
   let Inst{15} = 0;
 }
 
-def t2UBFX: T2I<(outs rGPR:$dst), (ins rGPR:$src, imm0_31:$lsb, imm0_31:$width),
-                 IIC_iUNAsi, "ubfx", "\t$dst, $src, $lsb, $width", []> {
+def t2UBFX: T2I<(outs rGPR:$Rd), (ins rGPR:$Rn, bf_inv_mask_imm:$imm),
+                 IIC_iUNAsi, "ubfx", "\t$Rd, $Rn, $imm", []> {
   let Inst{31-27} = 0b11110;
   let Inst{25} = 1;
   let Inst{24-20} = 0b11100;
@@ -2017,11 +2038,11 @@ def t2UBFX: T2I<(outs rGPR:$dst), (ins rGPR:$src, imm0_31:$lsb, imm0_31:$width),
 }
 
 // A8.6.18  BFI - Bitfield insert (Encoding T1)
-let Constraints = "$src = $dst" in
-def t2BFI : T2I<(outs rGPR:$dst),
-                (ins rGPR:$src, rGPR:$val, bf_inv_mask_imm:$imm),
-                IIC_iBITi, "bfi", "\t$dst, $val, $imm",
-                [(set rGPR:$dst, (ARMbfi rGPR:$src, rGPR:$val,
+let Constraints = "$src = $Rd" in
+def t2BFI : T2BitFI<(outs rGPR:$Rd),
+                (ins rGPR:$src, rGPR:$Rn, bf_inv_mask_imm:$imm),
+                IIC_iBITi, "bfi", "\t$Rd, $Rn, $imm",
+                [(set rGPR:$Rd, (ARMbfi rGPR:$src, rGPR:$Rn,
                                  bf_inv_mask_imm:$imm))]> {
   let Inst{31-27} = 0b11110;
   let Inst{25} = 1;
diff --git a/test/MC/ARM/thumb2.s b/test/MC/ARM/thumb2.s
index eb5336f4283..b60ad94d750 100644
--- a/test/MC/ARM/thumb2.s
+++ b/test/MC/ARM/thumb2.s
@@ -52,3 +52,9 @@
 @ CHECK: rrx	r0, r0                  @ encoding: [0x30,0x00,0x4f,0xea]
   rrx	r0, r0
 
+@ CHECK: bfc	r0, #4, #20             @ encoding: [0x17,0x10,0x6f,0xf3]
+  bfc	r0, #4, #20
+@ CHECK: bfc	r0, #0, #23             @ encoding: [0x16,0x00,0x6f,0xf3]
+  bfc	r0, #0, #23
+@ CHECK: bfc	r0, #12, #20            @ encoding: [0x1f,0x30,0x6f,0xf3]
+  bfc	r0, #12, #20
-- 
2.11.0