From 470f6402ea49a81a5c861fcce66cb05ebff977c1 Mon Sep 17 00:00:00 2001
From: Xavier Leroy <xavier.leroy@inria.fr>
Date: Sat, 12 Sep 2015 19:04:12 +0200
Subject: PowerPC 64 bits: alternate, more efficient implementations of int64
 operations.

---
 runtime/powerpc/ppc64/i64_stof.s | 68 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 runtime/powerpc/ppc64/i64_stof.s

(limited to 'runtime/powerpc/ppc64/i64_stof.s')

diff --git a/runtime/powerpc/ppc64/i64_stof.s b/runtime/powerpc/ppc64/i64_stof.s
new file mode 100644
index 00000000..8830d594
--- /dev/null
+++ b/runtime/powerpc/ppc64/i64_stof.s
@@ -0,0 +1,68 @@
+# *****************************************************************
+#
+#               The Compcert verified compiler
+#
+#           Xavier Leroy, INRIA Paris-Rocquencourt
+#
+# Copyright (c) 2013 Institut National de Recherche en Informatique et
+#  en Automatique.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in the
+#       documentation and/or other materials provided with the distribution.
+#     * Neither the name of the <organization> nor the
+#       names of its contributors may be used to endorse or promote products
+#       derived from this software without specific prior written permission.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT
+# HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# *********************************************************************
+
+# Helper functions for 64-bit integer arithmetic.  PowerPC 64 version.
+
+        .text
+
+### Conversion from signed long to single float	
+
+        .balign 16
+        .globl __i64_stof
+__i64_stof:
+        rldimi r4, r3, 32, 0   # reassemble (r3,r4) as a 64-bit integer in r4
+   # Check whether -2^53 <= X < 2^53	
+        sradi r5, r4, 53
+        addi r5, r5, 1
+        cmpldi r5, 2
+	blt 1f
+   # X is large enough that double rounding can occur.
+   # Avoid it by nudging X away from the points where double rounding
+   # occurs (the "round to odd" technique)
+        rldicl r5, r4, 0, 53     # extract bits 0 to 11 of X
+        addi r5, r5, 0x7FF       # r5 = (X & 0x7FF) + 0x7FF
+   # bit 12 of r5 is 0 if all low 12 bits of X are 0, 1 otherwise
+   # bits 13-63 of r5 are 0
+        or r4, r4, r5            # correct bit number 12 of X
+        rldicr r4, r4, 0, 52     # set to 0 bits 0 to 11 of X
+   # Convert to double, then round to single
+1:      stdu r4, -16(r1)
+        lfd f1, 0(r1)
+        fcfid f1, f1
+	frsp f1, f1
+        addi r1, r1, 16
+        blr
+        .type __i64_stof, @function
+        .size __i64_stof, .-__i64_stof
+	
-- 
cgit