libm: build fma(3), fmaf(3), fmal(3) on powerpc.
For now this builds the C version, for completeness, so that e.g. lang/ocaml can be configured & built. However, googling reveals that powerpc does have a "fused multiply add" instruction, ref. https://www.ibm.com/docs/en/aix/7.1?topic=set-fmadd-fma-floating-multiply-add-instruction so this could probably be taken advantage of for a more optimized version.
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# $NetBSD: Makefile,v 1.214 2021/07/21 12:05:02 tnn Exp $
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# $NetBSD: Makefile,v 1.215 2022/06/23 07:50:14 he Exp $
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#
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#
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# @(#)Makefile 5.1beta 93/09/24
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# @(#)Makefile 5.1beta 93/09/24
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#
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#
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@ -194,6 +194,7 @@ ARCH_SRCS += s_fmin.S s_fminf.S
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.if ${MKSOFTFLOAT} == "no"
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.if ${MKSOFTFLOAT} == "no"
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COMMON_SRCS += fenv.c
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COMMON_SRCS += fenv.c
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.endif
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.endif
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COMMON_SRCS+= s_fma.c s_fmaf.c s_fmal.c
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.elif (${LIBC_MACHINE_CPU} == "mips")
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.elif (${LIBC_MACHINE_CPU} == "mips")
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.PATH: ${.CURDIR}/arch/mips
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.PATH: ${.CURDIR}/arch/mips
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