From: Craig Topper <craig.topper@intel.com>
Date: Sat, 22 Jul 2017 01:30:51 +0000 (+0000)
Subject: [X86] Add register form of NOPL and NOPW for assembler/disassembler.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0765db21b887cc8ee46c1458b7c9b5c508953fca;p=llvm

[X86] Add register form of NOPL and NOPW for assembler/disassembler.

Fixes PR32805.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308817 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td
index fab70e918b8..700a9c0da79 100644
--- a/lib/Target/X86/X86InstrInfo.td
+++ b/lib/Target/X86/X86InstrInfo.td
@@ -1108,6 +1108,11 @@ let hasSideEffects = 0, SchedRW = [WriteZero] in {
                 "nop{w}\t$zero", [], IIC_NOP>, TB, OpSize16;
   def NOOPL : I<0x1f, MRMXm, (outs), (ins i32mem:$zero),
                 "nop{l}\t$zero", [], IIC_NOP>, TB, OpSize32;
+  // Also allow register so we can assemble/disassemble
+  def NOOPWr : I<0x1f, MRMXr, (outs), (ins GR16:$zero),
+                 "nop{w}\t$zero", [], IIC_NOP>, TB, OpSize16;
+  def NOOPLr : I<0x1f, MRMXr, (outs), (ins GR32:$zero),
+                 "nop{l}\t$zero", [], IIC_NOP>, TB, OpSize32;
 }
 
 
diff --git a/test/MC/Disassembler/X86/x86-32.txt b/test/MC/Disassembler/X86/x86-32.txt
index 1b865d37bf0..5a09550a708 100644
--- a/test/MC/Disassembler/X86/x86-32.txt
+++ b/test/MC/Disassembler/X86/x86-32.txt
@@ -791,3 +791,9 @@
 
 # CHECK: lwpval $2309737967, (%esp), %edx
 0x8f 0xea 0x68 0x12 0x0c 0x24 0xef 0xcd 0xab 0x89
+
+# CHECK: nopl %eax
+0x0f 0x1f 0xc0
+
+# CHECK: nopw %ax
+0x66 0x0f 0x1f 0xc0
diff --git a/test/MC/X86/x86-32-coverage.s b/test/MC/X86/x86-32-coverage.s
index c4f649ff4f4..706039a7a21 100644
--- a/test/MC/X86/x86-32-coverage.s
+++ b/test/MC/X86/x86-32-coverage.s
@@ -2067,6 +2067,14 @@
 // CHECK:  encoding: [0x0f,0x1f,0x05,0x78,0x56,0x34,0x12]
         	nopl	0x12345678
 
+// CHECK: nopw	%ax
+// CHECK:  encoding: [0x66,0x0f,0x1f,0xc0]
+        	nopw	%ax
+
+// CHECK: nopl	%eax
+// CHECK:  encoding: [0x0f,0x1f,0xc0]
+        	nopl	%eax
+
 // CHECK: nop
 // CHECK:  encoding: [0x90]
         	nop