derek.holloway
7502bf64a4
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28 lines
737 B
LLVM
28 lines
737 B
LLVM
; RUN: llc -mtriple=hexagon < %s | FileCheck %s
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; CHECK-LABEL: test_readcyclecounter
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; CHECK: r1:0 = c15:14
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define i64 @test_readcyclecounter() nounwind {
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%t0 = call i64 @llvm.readcyclecounter()
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ret i64 %t0
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}
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;; Make sure readcyclecounter calls are not optmized out and
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;; not moved across function calls.
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; CHECK-LABEL: test_readcyclecounter2
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; CHECK: [[R1:r[0-9:]+]] = c15:14
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; CHECK: call fun
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; CHECK: [[R2:r[0-9:]+]] = c15:14
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; CHECK: [[R3:r[0-9:]+]] = sub([[R2]],[[R1]])
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define i64 @test_readcyclecounter2() {
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%1 = tail call i64 @llvm.readcyclecounter()
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tail call void @fun()
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%2 = tail call i64 @llvm.readcyclecounter()
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%sub = sub i64 %2, %1
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ret i64 %sub
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}
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declare i64 @llvm.readcyclecounter()
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declare void @fun()
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