86 lines
2.8 KiB
LLVM
86 lines
2.8 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mcpu=core-avx-i -mattr=+rdrnd | FileCheck %s
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declare {i16, i32} @llvm.x86.rdrand.16()
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declare {i32, i32} @llvm.x86.rdrand.32()
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declare {i64, i32} @llvm.x86.rdrand.64()
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define i32 @_rdrand16_step(i16* %random_val) {
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%call = call {i16, i32} @llvm.x86.rdrand.16()
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%randval = extractvalue {i16, i32} %call, 0
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store i16 %randval, i16* %random_val
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%isvalid = extractvalue {i16, i32} %call, 1
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ret i32 %isvalid
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; CHECK-LABEL: _rdrand16_step:
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; CHECK: rdrandw %ax
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; CHECK: movzwl %ax, %ecx
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; CHECK: movl $1, %eax
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; CHECK: cmovael %ecx, %eax
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; CHECK: movw %cx, (%r[[A0:di|cx]])
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; CHECK: ret
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}
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define i32 @_rdrand32_step(i32* %random_val) {
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%call = call {i32, i32} @llvm.x86.rdrand.32()
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%randval = extractvalue {i32, i32} %call, 0
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store i32 %randval, i32* %random_val
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%isvalid = extractvalue {i32, i32} %call, 1
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ret i32 %isvalid
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; CHECK-LABEL: _rdrand32_step:
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; CHECK: rdrandl %e[[T0:[a-z]+]]
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; CHECK: movl $1, %eax
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; CHECK: cmovael %e[[T0]], %eax
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; CHECK: movl %e[[T0]], (%r[[A0]])
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; CHECK: ret
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}
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define i32 @_rdrand64_step(i64* %random_val) {
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%call = call {i64, i32} @llvm.x86.rdrand.64()
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%randval = extractvalue {i64, i32} %call, 0
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store i64 %randval, i64* %random_val
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%isvalid = extractvalue {i64, i32} %call, 1
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ret i32 %isvalid
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; CHECK-LABEL: _rdrand64_step:
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; CHECK: rdrandq %r[[T1:[a-z]+]]
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; CHECK: movl $1, %eax
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; CHECK: cmovael %e[[T1]], %eax
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; CHECK: movq %r[[T1]], (%r[[A0]])
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; CHECK: ret
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}
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; Check that MachineCSE doesn't eliminate duplicate rdrand instructions.
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define i32 @CSE() nounwind {
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%rand1 = tail call { i32, i32 } @llvm.x86.rdrand.32() nounwind
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%v1 = extractvalue { i32, i32 } %rand1, 0
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%rand2 = tail call { i32, i32 } @llvm.x86.rdrand.32() nounwind
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%v2 = extractvalue { i32, i32 } %rand2, 0
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%add = add i32 %v2, %v1
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ret i32 %add
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; CHECK-LABEL: CSE:
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; CHECK: rdrandl
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; CHECK: rdrandl
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}
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; Check that MachineLICM doesn't hoist rdrand instructions.
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define void @loop(i32* %p, i32 %n) nounwind {
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entry:
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%tobool1 = icmp eq i32 %n, 0
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br i1 %tobool1, label %while.end, label %while.body
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while.body: ; preds = %entry, %while.body
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%p.addr.03 = phi i32* [ %incdec.ptr, %while.body ], [ %p, %entry ]
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%n.addr.02 = phi i32 [ %dec, %while.body ], [ %n, %entry ]
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%dec = add nsw i32 %n.addr.02, -1
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%incdec.ptr = getelementptr inbounds i32, i32* %p.addr.03, i64 1
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%rand = tail call { i32, i32 } @llvm.x86.rdrand.32() nounwind
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%v1 = extractvalue { i32, i32 } %rand, 0
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store i32 %v1, i32* %p.addr.03, align 4
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%tobool = icmp eq i32 %dec, 0
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br i1 %tobool, label %while.end, label %while.body
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while.end: ; preds = %while.body, %entry
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ret void
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; CHECK-LABEL: loop:
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; CHECK-NOT: rdrandl
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; CHECK: This Inner Loop Header: Depth=1
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; CHECK: rdrandl
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}
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