1 files changed, 85 insertions, 0 deletions
diff --git a/test/CodeGen/X86/rdrand.ll b/test/CodeGen/X86/rdrand.ll
new file mode 100644
index 0000000..e2224a6
--- /dev/null
+++ b/test/CodeGen/X86/rdrand.ll
@@ -0,0 +1,85 @@
+; RUN: llc < %s -march=x86-64 -mcpu=core-avx-i -mattr=+rdrand | FileCheck %s
+declare {i16, i32} @llvm.x86.rdrand.16()
+declare {i32, i32} @llvm.x86.rdrand.32()
+declare {i64, i32} @llvm.x86.rdrand.64()
+
+define i32 @_rdrand16_step(i16* %random_val) {
+  %call = call {i16, i32} @llvm.x86.rdrand.16()
+  %randval = extractvalue {i16, i32} %call, 0
+  store i16 %randval, i16* %random_val
+  %isvalid = extractvalue {i16, i32} %call, 1
+  ret i32 %isvalid
+; CHECK: _rdrand16_step:
+; CHECK: rdrandw	%ax
+; CHECK: movw	%ax, (%r[[A0:di|cx]])
+; CHECK: movzwl	%ax, %ecx
+; CHECK: movl	$1, %eax
+; CHECK: cmovael	%ecx, %eax
+; CHECK: ret
+}
+
+define i32 @_rdrand32_step(i32* %random_val) {
+  %call = call {i32, i32} @llvm.x86.rdrand.32()
+  %randval = extractvalue {i32, i32} %call, 0
+  store i32 %randval, i32* %random_val
+  %isvalid = extractvalue {i32, i32} %call, 1
+  ret i32 %isvalid
+; CHECK: _rdrand32_step:
+; CHECK: rdrandl	%e[[T0:[a-z]+]]
+; CHECK: movl	%e[[T0]], (%r[[A0]])
+; CHECK: movl	$1, %eax
+; CHECK: cmovael	%e[[T0]], %eax
+; CHECK: ret
+}
+
+define i32 @_rdrand64_step(i64* %random_val) {
+  %call = call {i64, i32} @llvm.x86.rdrand.64()
+  %randval = extractvalue {i64, i32} %call, 0
+  store i64 %randval, i64* %random_val
+  %isvalid = extractvalue {i64, i32} %call, 1
+  ret i32 %isvalid
+; CHECK: _rdrand64_step:
+; CHECK: rdrandq	%r[[T1:[[a-z]+]]
+; CHECK: movq	%r[[T1]], (%r[[A0]])
+; CHECK: movl	$1, %eax
+; CHECK: cmovael	%e[[T1]], %eax
+; CHECK: ret
+}
+
+; Check that MachineCSE doesn't eliminate duplicate rdrand instructions.
+define i32 @CSE() nounwind {
+ %rand1 = tail call { i32, i32 } @llvm.x86.rdrand.32() nounwind
+ %v1 = extractvalue { i32, i32 } %rand1, 0
+ %rand2 = tail call { i32, i32 } @llvm.x86.rdrand.32() nounwind
+ %v2 = extractvalue { i32, i32 } %rand2, 0
+ %add = add i32 %v2, %v1
+ ret i32 %add
+; CHECK: CSE:
+; CHECK: rdrandl
+; CHECK: rdrandl
+}
+
+; Check that MachineLICM doesn't hoist rdrand instructions.
+define void @loop(i32* %p, i32 %n) nounwind {
+entry:
+  %tobool1 = icmp eq i32 %n, 0
+  br i1 %tobool1, label %while.end, label %while.body
+
+while.body:                                       ; preds = %entry, %while.body
+  %p.addr.03 = phi i32* [ %incdec.ptr, %while.body ], [ %p, %entry ]
+  %n.addr.02 = phi i32 [ %dec, %while.body ], [ %n, %entry ]
+  %dec = add nsw i32 %n.addr.02, -1
+  %incdec.ptr = getelementptr inbounds i32* %p.addr.03, i64 1
+  %rand = tail call { i32, i32 } @llvm.x86.rdrand.32() nounwind
+  %v1 = extractvalue { i32, i32 } %rand, 0
+  store i32 %v1, i32* %p.addr.03, align 4
+  %tobool = icmp eq i32 %dec, 0
+  br i1 %tobool, label %while.end, label %while.body
+
+while.end:                                        ; preds = %while.body, %entry
+  ret void
+; CHECK: loop:
+; CHECK-NOT: rdrandl
+; CHECK: This Inner Loop Header: Depth=1
+; CHECK: rdrandl
+}