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llvm-project/llvm/test/CodeGen/R600/llvm.AMDGPU.legacy.rsq.ll

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R600: Fix inconsistency in rsq instructions. 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. llvm-svn: 211637
2014-06-25 06:13:39 +08:00
; RUN: llc -march=r600 -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
; RUN: llc -march=r600 -mcpu=cypress -verify-machineinstrs < %s | FileCheck -check-prefix=EG -check-prefix=FUNC %s
declare float @llvm.AMDGPU.legacy.rsq(float) nounwind readnone
R600: Call EmitFunctionHeader() in the AsmPrinter to populate the ELF symbol table llvm-svn: 218776
2014-10-02 01:15:17 +08:00
; FUNC-LABEL: {{^}}rsq_legacy_f32:
R600: Fix inconsistency in rsq instructions. 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. llvm-svn: 211637
2014-06-25 06:13:39 +08:00
; SI: V_RSQ_LEGACY_F32_e32
; EG: RECIPSQRT_IEEE
define void @rsq_legacy_f32(float addrspace(1)* %out, float %src) nounwind {
%rsq = call float @llvm.AMDGPU.legacy.rsq(float %src) nounwind readnone
store float %rsq, float addrspace(1)* %out, align 4
ret void
}