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Diffstat (limited to 'runtime/arm/i64_scmp.s')
| -rw-r--r-- | runtime/arm/i64_scmp.s | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/runtime/arm/i64_scmp.s b/runtime/arm/i64_scmp.s new file mode 100644 index 0000000..144a13c --- /dev/null +++ b/runtime/arm/i64_scmp.s @@ -0,0 +1,56 @@ +@ ***************************************************************** +@ +@ 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. ARM version. + + .text + +@@@ Signed comparison + + .global __i64_scmp +__i64_scmp: + cmp r0, r2 @ compare low words (unsigned) + moveq r0, #0 @ res = 0 if eq + movhi r0, #1 @ res = 1 if unsigned higher + mvnlo r0, #0 @ res = -1 if unsigned lower + cmp r1, r3 @ compare high words (signed) + addgt r0, r0, #2 @ res += 2 if signed greater + sublt r0, r0, #2 @ res -= 2 if signed less + @ here, r0 = 0 if X == Y + @ r0 = -3, -2, -1 if X < Y + @ r0 = 1, 2, 3 if X > Y + bx lr + .type __i64_scmp, %function + .size __i64_scmp, . - __i64_scmp + |