1 files changed, 96 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/ppc/divtc3.c b/contrib/llvm-project/compiler-rt/lib/builtins/ppc/divtc3.c
new file mode 100644
index 000000000000..afaccf5a8fd6
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/ppc/divtc3.c
@@ -0,0 +1,96 @@
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#include "../int_math.h"
+#include "DD.h"
+// Use DOUBLE_PRECISION because the soft-fp method we use is logb (on the upper
+// half of the long doubles), even though this file defines complex division for
+// 128-bit floats.
+#define DOUBLE_PRECISION
+#include "../fp_lib.h"
+
+#if !defined(CRT_INFINITY) && defined(HUGE_VAL)
+#define CRT_INFINITY HUGE_VAL
+#endif // CRT_INFINITY
+
+#define makeFinite(x)                                                          \
+  {                                                                            \
+    (x).s.hi = crt_copysign(crt_isinf((x).s.hi) ? 1.0 : 0.0, (x).s.hi);        \
+    (x).s.lo = 0.0;                                                            \
+  }
+
+long double _Complex __divtc3(long double a, long double b, long double c,
+                              long double d) {
+  DD cDD = {.ld = c};
+  DD dDD = {.ld = d};
+
+  int ilogbw = 0;
+  const double logbw =
+      __compiler_rt_logb(crt_fmax(crt_fabs(cDD.s.hi), crt_fabs(dDD.s.hi)));
+
+  if (crt_isfinite(logbw)) {
+    ilogbw = (int)logbw;
+
+    cDD.s.hi = crt_scalbn(cDD.s.hi, -ilogbw);
+    cDD.s.lo = crt_scalbn(cDD.s.lo, -ilogbw);
+    dDD.s.hi = crt_scalbn(dDD.s.hi, -ilogbw);
+    dDD.s.lo = crt_scalbn(dDD.s.lo, -ilogbw);
+  }
+
+  const long double denom =
+      __gcc_qadd(__gcc_qmul(cDD.ld, cDD.ld), __gcc_qmul(dDD.ld, dDD.ld));
+  const long double realNumerator =
+      __gcc_qadd(__gcc_qmul(a, cDD.ld), __gcc_qmul(b, dDD.ld));
+  const long double imagNumerator =
+      __gcc_qsub(__gcc_qmul(b, cDD.ld), __gcc_qmul(a, dDD.ld));
+
+  DD real = {.ld = __gcc_qdiv(realNumerator, denom)};
+  DD imag = {.ld = __gcc_qdiv(imagNumerator, denom)};
+
+  real.s.hi = crt_scalbn(real.s.hi, -ilogbw);
+  real.s.lo = crt_scalbn(real.s.lo, -ilogbw);
+  imag.s.hi = crt_scalbn(imag.s.hi, -ilogbw);
+  imag.s.lo = crt_scalbn(imag.s.lo, -ilogbw);
+
+  if (crt_isnan(real.s.hi) && crt_isnan(imag.s.hi)) {
+    DD aDD = {.ld = a};
+    DD bDD = {.ld = b};
+    DD rDD = {.ld = denom};
+
+    if ((rDD.s.hi == 0.0) && (!crt_isnan(aDD.s.hi) || !crt_isnan(bDD.s.hi))) {
+      real.s.hi = crt_copysign(CRT_INFINITY, cDD.s.hi) * aDD.s.hi;
+      real.s.lo = 0.0;
+      imag.s.hi = crt_copysign(CRT_INFINITY, cDD.s.hi) * bDD.s.hi;
+      imag.s.lo = 0.0;
+    }
+
+    else if ((crt_isinf(aDD.s.hi) || crt_isinf(bDD.s.hi)) &&
+             crt_isfinite(cDD.s.hi) && crt_isfinite(dDD.s.hi)) {
+      makeFinite(aDD);
+      makeFinite(bDD);
+      real.s.hi = CRT_INFINITY * (aDD.s.hi * cDD.s.hi + bDD.s.hi * dDD.s.hi);
+      real.s.lo = 0.0;
+      imag.s.hi = CRT_INFINITY * (bDD.s.hi * cDD.s.hi - aDD.s.hi * dDD.s.hi);
+      imag.s.lo = 0.0;
+    }
+
+    else if ((crt_isinf(cDD.s.hi) || crt_isinf(dDD.s.hi)) &&
+             crt_isfinite(aDD.s.hi) && crt_isfinite(bDD.s.hi)) {
+      makeFinite(cDD);
+      makeFinite(dDD);
+      real.s.hi =
+          crt_copysign(0.0, (aDD.s.hi * cDD.s.hi + bDD.s.hi * dDD.s.hi));
+      real.s.lo = 0.0;
+      imag.s.hi =
+          crt_copysign(0.0, (bDD.s.hi * cDD.s.hi - aDD.s.hi * dDD.s.hi));
+      imag.s.lo = 0.0;
+    }
+  }
+
+  long double _Complex z;
+  __real__ z = real.ld;
+  __imag__ z = imag.ld;
+
+  return z;
+}