Expose move to/from coprocessor instructions in MIPS64 mode.

Note: [D]M{T,F}CP2 is just a recommended encoding.  Vendors often provide a
custom CP2 that interprets instructions differently and may wish to add their
own instructions that use this opcode.  We should ensure that this is easy to
do.  I will probably add a 'has custom CP{0-3}' subtarget flag to make this
easy: We want to avoid the GCC situation where every MIPS vendor makes a custom
fork that breaks every other MIPS CPU and so can't be merged upstream.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165711 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 67 insertions, 0 deletions

diff --git a/lib/Target/Mips/Mips64InstrInfo.td b/lib/Target/Mips/Mips64InstrInfo.td
index bd472d6f67..99a9f25abd 100644
--- a/lib/Target/Mips/Mips64InstrInfo.td
+++ b/lib/Target/Mips/Mips64InstrInfo.td
@@ -315,3 +315,33 @@ def : MipsPat<(bswap CPU64Regs:$rt), (DSHD (DSBH CPU64Regs:$rt))>;
 // Instruction aliases
 //===----------------------------------------------------------------------===//
 def : InstAlias<"move $dst,$src", (DADD CPU64Regs:$dst,CPU64Regs:$src,ZERO_64)>;
+
+/// Move between CPU and coprocessor registers
+let DecoderNamespace = "Mips64" in {
+def MFC0_3OP64  : MFC3OP<0x10, 0, (outs CPU64Regs:$rt), 
+                       (ins CPU64Regs:$rd, uimm16:$sel),"mfc0\t$rt, $rd, $sel">;
+def MTC0_3OP64  : MFC3OP<0x10, 4, (outs CPU64Regs:$rd, uimm16:$sel),
+                       (ins CPU64Regs:$rt),"mtc0\t$rt, $rd, $sel">;
+def MFC2_3OP64  : MFC3OP<0x12, 0, (outs CPU64Regs:$rt),
+                       (ins CPU64Regs:$rd, uimm16:$sel),"mfc2\t$rt, $rd, $sel">;
+def MTC2_3OP64  : MFC3OP<0x12, 4, (outs CPU64Regs:$rd, uimm16:$sel),
+                       (ins CPU64Regs:$rt),"mtc2\t$rt, $rd, $sel">;
+def DMFC0_3OP64  : MFC3OP<0x10, 1, (outs CPU64Regs:$rt), 
+                       (ins CPU64Regs:$rd, uimm16:$sel),"dmfc0\t$rt, $rd, $sel">;
+def DMTC0_3OP64  : MFC3OP<0x10, 5, (outs CPU64Regs:$rd, uimm16:$sel),
+                       (ins CPU64Regs:$rt),"dmtc0\t$rt, $rd, $sel">;
+def DMFC2_3OP64  : MFC3OP<0x12, 1, (outs CPU64Regs:$rt),
+                       (ins CPU64Regs:$rd, uimm16:$sel),"dmfc2\t$rt, $rd, $sel">;
+def DMTC2_3OP64  : MFC3OP<0x12, 5, (outs CPU64Regs:$rd, uimm16:$sel),
+                       (ins CPU64Regs:$rt),"dmtc2\t$rt, $rd, $sel">;
+}
+// Two operand (implicit 0 selector) versions:
+def : InstAlias<"mfc0 $rt, $rd", (MFC0_3OP64 CPU64Regs:$rt, CPU64Regs:$rd, 0)>;
+def : InstAlias<"mtc0 $rt, $rd", (MTC0_3OP64 CPU64Regs:$rd, 0, CPU64Regs:$rt)>;
+def : InstAlias<"mfc2 $rt, $rd", (MFC2_3OP64 CPU64Regs:$rt, CPU64Regs:$rd, 0)>;
+def : InstAlias<"mtc2 $rt, $rd", (MTC2_3OP64 CPU64Regs:$rd, 0, CPU64Regs:$rt)>;
+def : InstAlias<"dmfc0 $rt, $rd", (DMFC0_3OP64 CPU64Regs:$rt, CPU64Regs:$rd, 0)>;
+def : InstAlias<"dmtc0 $rt, $rd", (DMTC0_3OP64 CPU64Regs:$rd, 0, CPU64Regs:$rt)>;
+def : InstAlias<"dmfc2 $rt, $rd", (DMFC2_3OP64 CPU64Regs:$rt, CPU64Regs:$rd, 0)>;
+def : InstAlias<"dmtc2 $rt, $rd", (DMTC2_3OP64 CPU64Regs:$rd, 0, CPU64Regs:$rt)>;
+
diff --git a/test/MC/Mips/mips-coprocessor-encodings.s b/test/MC/Mips/mips-coprocessor-encodings.s
new file mode 100644
index 0000000000..bad9163ba9
--- /dev/null
+++ b/test/MC/Mips/mips-coprocessor-encodings.s
@@ -0,0 +1,37 @@
+# RUN: llvm-mc %s -triple=mips64-unknown-freebsd -show-encoding | FileCheck --check-prefix=MIPS64 %s
+
+# MIPS64:	dmtc0	$12, $16, 2             # encoding: [0x40,0xac,0x80,0x02]
+# MIPS64:	dmtc0	$12, $16, 0             # encoding: [0x40,0xac,0x80,0x00]
+# MIPS64:	mtc0	$12, $16, 2             # encoding: [0x40,0x8c,0x80,0x02]
+# MIPS64:	mtc0	$12, $16, 0             # encoding: [0x40,0x8c,0x80,0x00]
+# MIPS64:	dmfc0	$12, $16, 2             # encoding: [0x40,0x2c,0x80,0x02]
+# MIPS64:	dmfc0	$12, $16, 0             # encoding: [0x40,0x2c,0x80,0x00]
+# MIPS64:	mfc0	$12, $16, 2             # encoding: [0x40,0x0c,0x80,0x02]
+# MIPS64:	mfc0	$12, $16, 0             # encoding: [0x40,0x0c,0x80,0x00]
+
+	dmtc0	$12, $16, 2
+	dmtc0	$12, $16
+	mtc0	$12, $16, 2
+	mtc0	$12, $16
+	dmfc0	$12, $16, 2
+	dmfc0	$12, $16
+	mfc0	$12, $16, 2
+	mfc0	$12, $16
+
+# MIPS64:	dmtc2	$12, $16, 2             # encoding: [0x48,0xac,0x80,0x02]
+# MIPS64:	dmtc2	$12, $16, 0             # encoding: [0x48,0xac,0x80,0x00]
+# MIPS64:	mtc2	$12, $16, 2             # encoding: [0x48,0x8c,0x80,0x02]
+# MIPS64:	mtc2	$12, $16, 0             # encoding: [0x48,0x8c,0x80,0x00]
+# MIPS64:	dmfc2	$12, $16, 2             # encoding: [0x48,0x2c,0x80,0x02]
+# MIPS64:	dmfc2	$12, $16, 0             # encoding: [0x48,0x2c,0x80,0x00]
+# MIPS64:	mfc2	$12, $16, 2             # encoding: [0x48,0x0c,0x80,0x02]
+# MIPS64:	mfc2	$12, $16, 0             # encoding: [0x48,0x0c,0x80,0x00]
+
+	dmtc2	$12, $16, 2
+	dmtc2	$12, $16
+	mtc2	$12, $16, 2
+	mtc2	$12, $16
+	dmfc2	$12, $16, 2
+	dmfc2	$12, $16
+	mfc2	$12, $16, 2
+	mfc2	$12, $16