# *****************************************************************
#
#               The Compcert verified compiler
#
#           Xavier Leroy, INRIA Paris
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# Copyright (c) 2016 Institut National de Recherche en Informatique et
#  en Automatique.
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# Helper functions for 64-bit integer arithmetic.  PowerPC version.

        .text

# Unsigned multiply high
	
# Reference C implementation in ../c/i64_umul.c

        .balign 16
        .globl __i64_umulh
__i64_umulh:
     # u1 in r3; u0 in r4; v1 in r5; v0 in r6
        mulhwu   r0, r4, r6     # k (in r0) = high((u64) u0 * (u64) v0)
        mullw    r8, r3, r6
        mulhwu   r7, r3, r6     # t (in r8:r7) = (u64) u1 * (u64) v0
        addc     r0, r8, r0     # w1 (in r0) = low (t + k)
        addze    r9, r7         # w2 (in r9) = high (t + k)
        mullw    r8, r4, r5
        mulhwu   r7, r4, r5     # t (in r8:r7) = (u64) u0 * (u64) v1
        addc     r0, r8, r0     # tmp (in r0) = low (t + w1)
        addze    r0, r7         # k (in r0) = high(t + w1)
        mullw    r8, r3, r5
        mulhwu   r7, r3, r5     # t (in r8:r7) = (u64) u1 * (u64) v1
        addc     r4, r8, r9     # add w2
        addze    r3, r7
        addc     r4, r4, r0     # add k
        addze    r3, r3
        blr
        .type __i64_umulh, @function
        .size __i64_umulh, .-__i64_umulh