4 files changed, 42 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/clzero.ll b/llvm/test/CodeGen/X86/clzero.ll
new file mode 100644
index 00000000000..f15d4deedef
--- /dev/null
+++ b/llvm/test/CodeGen/X86/clzero.ll
@@ -0,0 +1,23 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-linux -mattr=+clzero | FileCheck %s --check-prefix=X64
+; RUN: llc < %s -mtriple=i386-pc-linux -mattr=+clzero | FileCheck %s --check-prefix=X32
+
+define void @foo(i8* %p) #0 {
+; X64-LABEL: foo:
+; X64:       # BB#0: # %entry
+; X64-NEXT:    leaq (%rdi), %rax
+; X64-NEXT:    clzero
+; X64-NEXT:    retq
+;
+; X32-LABEL: foo:
+; X32:       # BB#0: # %entry
+; X32-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; X32-NEXT:    leal (%eax), %eax
+; X32-NEXT:    clzero
+; X32-NEXT:    retl
+entry:
+  tail call void @llvm.x86.clzero(i8* %p) #1
+  ret void
+}
+
+declare void @llvm.x86.clzero(i8*) #1
diff --git a/llvm/test/MC/Disassembler/X86/x86-32.txt b/llvm/test/MC/Disassembler/X86/x86-32.txt
index 01d21c5d0fc..9dd49e51d91 100644
--- a/llvm/test/MC/Disassembler/X86/x86-32.txt
+++ b/llvm/test/MC/Disassembler/X86/x86-32.txt
@@ -129,6 +129,9 @@
 # CHECK: invlpga
 0x0f 0x01 0xdf
 
+# CHECK: clzero
+0x0f,0x01,0xfc
+
 # CHECK: movl $0, -4(%ebp)
 0xc7 0x45 0xfc 0x00 0x00 0x00 0x00
 
diff --git a/llvm/test/MC/X86/x86-32.s b/llvm/test/MC/X86/x86-32.s
index c05cf41d91e..f3633dcffef 100644
--- a/llvm/test/MC/X86/x86-32.s
+++ b/llvm/test/MC/X86/x86-32.s
@@ -444,6 +444,14 @@ cmovnae	%bx,%bx
 // CHECK:  encoding: [0x0f,0x21,0xf8]
         movl %dr7,%eax
 
+// CHECK:       clzero
+// CHECK:  encoding: [0x0f,0x01,0xfc]
+                clzero
+
+// CHECK:       clzero
+// CHECK:  encoding: [0x0f,0x01,0xfc]
+                clzero %eax
+
 // radr://8017522
 // CHECK: wait
 // CHECK:  encoding: [0x9b]
diff --git a/llvm/test/MC/X86/x86-64.s b/llvm/test/MC/X86/x86-64.s
index 89dc599e04f..a605dbbbd74 100644
--- a/llvm/test/MC/X86/x86-64.s
+++ b/llvm/test/MC/X86/x86-64.s
@@ -1502,6 +1502,14 @@ vmovq %xmm0, %rax
 // CHECK:  encoding: [0x0f,0x01,0xfb]
         	mwaitx %rax, %rcx, %rbx
 
+// CHECK:       clzero
+// CHECK:  encoding: [0x0f,0x01,0xfc]
+                clzero
+
+// CHECK:       clzero
+// CHECK:  encoding: [0x0f,0x01,0xfc]
+                clzero %rax
+
 // CHECK: 	movl %r15d, (%r15,%r15)
 // CHECK:  encoding: [0x47,0x89,0x3c,0x3f]
 movl %r15d, (%r15,%r15)