From 8677229f6071c18fa2552ce9700a37e86bd33b4c Mon Sep 17 00:00:00 2001
From: gbeauche <>
Date: Sat, 18 Dec 2004 23:45:33 +0000
Subject: [PATCH] exp2f/log2f implementations if not existing

---
 SheepShaver/src/Unix/configure.ac             |  1 +
 .../kpx_cpu/src/cpu/ppc/ppc-operations.hpp    | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/SheepShaver/src/Unix/configure.ac b/SheepShaver/src/Unix/configure.ac
index 8a560358..62e56ed0 100644
--- a/SheepShaver/src/Unix/configure.ac
+++ b/SheepShaver/src/Unix/configure.ac
@@ -303,6 +303,7 @@ AC_CHECK_FUNCS(sigaction signal)
 AC_CHECK_FUNCS(mmap mprotect munmap)
 AC_CHECK_FUNCS(vm_allocate vm_deallocate vm_protect)
 AC_CHECK_FUNCS(posix_memalign memalign valloc)
+AC_CHECK_FUNCS(exp2f log2f exp2 log2)
 
 dnl Darwin seems to define mach_task_self() instead of task_self().
 AC_CHECK_FUNCS(mach_task_self task_self)
diff --git a/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-operations.hpp b/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-operations.hpp
index a9338555..eb57972c 100644
--- a/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-operations.hpp
+++ b/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-operations.hpp
@@ -127,6 +127,25 @@ DEFINE_ALIAS_OP(xor_64, xor, uint64);
 
 // Floating-point basic operations
 
+#ifndef HAVE_EXP2F
+#ifdef HAVE_EXP2
+#define exp2f(x) (float)exp2(x)
+#else
+#define exp2f(x) powf(2.0, (x))
+#endif
+#endif
+
+#ifndef HAVE_LOG2F
+#ifdef HAVE_LOG2
+#define log2f(x) (float)log2(x)
+#else
+#ifndef M_LN2
+#define M_LN2 logf(2.0)
+#endif
+#define log2f(x) logf(x) / M_LN2
+#endif
+#endif
+
 DEFINE_OP1(fnop, double, x);
 DEFINE_OP1(fabs, double, fabs(x));
 DEFINE_OP2(fadd, double, x + y);