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llvm-mirror/test/CodeGen/R600/llvm.AMDGPU.rsq.clamped.f64.ll
Matt Arsenault 37d6d91b5b 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
2014-06-24 22:13:39 +00:00

12 lines
485 B
LLVM

; RUN: llc -march=r600 -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
declare double @llvm.AMDGPU.rsq.clamped.f64(double) nounwind readnone
; FUNC-LABEL: @rsq_clamped_f64
; SI: V_RSQ_CLAMP_F64_e32
define void @rsq_clamped_f64(double addrspace(1)* %out, double %src) nounwind {
%rsq_clamped = call double @llvm.AMDGPU.rsq.clamped.f64(double %src) nounwind readnone
store double %rsq_clamped, double addrspace(1)* %out, align 8
ret void
}