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;; Licensed to the .NET Foundation under one or more agreements.
;; The .NET Foundation licenses this file to you under the MIT license.
;; See the LICENSE file in the project root for more information.
#include "AsmMacros.h"
TEXTAREA
IMPORT fmod
NESTED_ENTRY RhpFltRemRev
PROLOG_PUSH {r4,lr} ; Save return address (and r4 for stack alignment)
;; The CRT only exports the double form of fmod, so we need to convert our input registers (s0, s1) to
;; doubles (d0, d1). Unfortunately these registers overlap (d0 == s0/s1) so we need to move our inputs
;; elsewhere first. In this case we can move them into s4/s5, which are also volatile and don't need
;; to be preserved.
vmov.f32 s4, s0
vmov.f32 s5, s1
;; Convert s4 and s5 into d0 and d1.
vcvt.f64.f32 d0, s4
vcvt.f64.f32 d1, s5
;; Call the CRT's fmod to calculate the remainder into d0.
ldr r12, =fmod
blx r12
;; Convert double result back to single. As far as I can see it's legal to do this directly even
;; though d0 overlaps s0.
vcvt.f32.f64 s0, d0
EPILOG_POP {r4,lr}
EPILOG_RETURN
NESTED_END RhpFltRemRev
end
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