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95eb45c5d9
R600 was using a clamped version of rsq, but SI was not. Add a new rsq_clamped intrinsic and use them consistently. It's unclear to me from the documentation what behavior the R600 instructions have, so I assume they have the legacy behavior described by the SI documents. For R600, use RECIPSQRT_IEEE for both llvm.AMDGPU.rsq.legacy and llvm.AMDGPU.rsq. R600 also has RECIPSQRT_FF, which I'm not sure how it fits in here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211637 91177308-0d34-0410-b5e6-96231b3b80d8
14 lines
559 B
LLVM
14 lines
559 B
LLVM
; RUN: llc -march=r600 -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
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; RUN: llc -march=r600 -mcpu=cypress -verify-machineinstrs < %s | FileCheck -check-prefix=EG -check-prefix=FUNC %s
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declare float @llvm.AMDGPU.rsq.f32(float) nounwind readnone
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; FUNC-LABEL: @rsq_f32
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; SI: V_RSQ_F32_e32
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; EG: RECIPSQRT_IEEE
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define void @rsq_f32(float addrspace(1)* %out, float %src) nounwind {
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%rsq = call float @llvm.AMDGPU.rsq.f32(float %src) nounwind readnone
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store float %rsq, float addrspace(1)* %out, align 4
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ret void
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}
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