-; RUN: llc < rdrand.ll -march=x86-64 -mattr=+rdrand | FileCheck %s
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mcpu=core-avx-i -mattr=+rdrnd | FileCheck %s
declare {i16, i32} @llvm.x86.rdrand.16()
declare {i32, i32} @llvm.x86.rdrand.32()
declare {i64, i32} @llvm.x86.rdrand.64()
store i16 %randval, i16* %random_val
%isvalid = extractvalue {i16, i32} %call, 1
ret i32 %isvalid
-; CHECK: _rdrand16_step:
+; CHECK-LABEL: _rdrand16_step:
; CHECK: rdrandw %ax
-; CHECK: movw %ax, (%rdi)
; CHECK: movzwl %ax, %ecx
; CHECK: movl $1, %eax
; CHECK: cmovael %ecx, %eax
+; CHECK: movw %cx, (%r[[A0:di|cx]])
; CHECK: ret
}
store i32 %randval, i32* %random_val
%isvalid = extractvalue {i32, i32} %call, 1
ret i32 %isvalid
-; CHECK: _rdrand32_step:
-; CHECK: rdrandl %ecx
-; CHECK: movl %ecx, (%rdi)
+; CHECK-LABEL: _rdrand32_step:
+; CHECK: rdrandl %e[[T0:[a-z]+]]
; CHECK: movl $1, %eax
-; CHECK: cmovael %ecx, %eax
+; CHECK: cmovael %e[[T0]], %eax
+; CHECK: movl %e[[T0]], (%r[[A0]])
; CHECK: ret
}
store i64 %randval, i64* %random_val
%isvalid = extractvalue {i64, i32} %call, 1
ret i32 %isvalid
-; CHECK: _rdrand64_step:
-; CHECK: rdrandq %rcx
-; CHECK: movq %rcx, (%rdi)
+; CHECK-LABEL: _rdrand64_step:
+; CHECK: rdrandq %r[[T1:[a-z]+]]
; CHECK: movl $1, %eax
-; CHECK: cmovael %ecx, %eax
+; CHECK: cmovael %e[[T1]], %eax
+; CHECK: movq %r[[T1]], (%r[[A0]])
; 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-LABEL: 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, 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-LABEL: loop:
+; CHECK-NOT: rdrandl
+; CHECK: This Inner Loop Header: Depth=1
+; CHECK: rdrandl
+}