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adddf3vfp.S
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clzdi2.S
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save_vfp_d8_d15_regs.S
softfloat-alias.list
subdf3vfp.S
subsf3vfp.S
switch16.S
switch32.S
switch8.S
switchu8.S
sync-ops.h
sync_fetch_and_add_4.S
sync_fetch_and_add_8.S
sync_fetch_and_and_4.S
sync_fetch_and_and_8.S
sync_fetch_and_max_4.S
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sync_fetch_and_umax_4.S
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sync_fetch_and_umin_4.S
sync_fetch_and_umin_8.S
sync_fetch_and_xor_4.S
sync_fetch_and_xor_8.S
sync_synchronize.S
truncdfsf2vfp.S
udivmodsi4.S
udivsi3.S
umodsi3.S
unorddf2vfp.S
unordsf2vfp.S
i386
macho_embedded
ppc
x86_64
CMakeLists.txt
README.txt
absvdi2.c
absvsi2.c
absvti2.c
adddf3.c
addsf3.c
addtf3.c
addvdi3.c
addvsi3.c
addvti3.c
apple_versioning.c
ashldi3.c
ashlti3.c
ashrdi3.c
ashrti3.c
assembly.h
atomic.c
atomic_flag_clear.c
atomic_flag_clear_explicit.c
atomic_flag_test_and_set.c
atomic_flag_test_and_set_explicit.c
atomic_signal_fence.c
atomic_thread_fence.c
bswapdi2.c
bswapsi2.c
clear_cache.c
clzdi2.c
clzsi2.c
clzti2.c
cmpdi2.c
cmpti2.c
comparedf2.c
comparesf2.c
comparetf2.c
cpu_model.c
ctzdi2.c
ctzsi2.c
ctzti2.c
divdc3.c
divdf3.c
divdi3.c
divmoddi4.c
divmodsi4.c
divsc3.c
divsf3.c
divsi3.c
divtc3.c
divtf3.c
divti3.c
divxc3.c
emutls.c
enable_execute_stack.c
eprintf.c
extenddftf2.c
extendhfsf2.c
extendsfdf2.c
extendsftf2.c
ffsdi2.c
ffssi2.c
ffsti2.c
fixdfdi.c
fixdfsi.c
fixdfti.c
fixsfdi.c
fixsfsi.c
fixsfti.c
fixtfdi.c
fixtfsi.c
fixtfti.c
fixunsdfdi.c
fixunsdfsi.c
fixunsdfti.c
fixunssfdi.c
fixunssfsi.c
fixunssfti.c
fixunstfdi.c
fixunstfsi.c
fixunstfti.c
fixunsxfdi.c
fixunsxfsi.c
fixunsxfti.c
fixxfdi.c
fixxfti.c
floatdidf.c
floatdisf.c
floatditf.c
floatdixf.c
floatsidf.c
floatsisf.c
floatsitf.c
floattidf.c
floattisf.c
floattitf.c
floattixf.c
floatundidf.c
floatundisf.c
floatunditf.c
floatundixf.c
floatunsidf.c
floatunsisf.c
floatunsitf.c
floatuntidf.c
floatuntisf.c
floatuntitf.c
floatuntixf.c
fp_add_impl.inc
fp_extend.h
fp_extend_impl.inc
fp_fixint_impl.inc
fp_fixuint_impl.inc
fp_lib.h
fp_mul_impl.inc
fp_trunc.h
fp_trunc_impl.inc
gcc_personality_v0.c
int_endianness.h
int_lib.h
int_math.h
int_types.h
int_util.c
int_util.h
lshrdi3.c
lshrti3.c
mingw_fixfloat.c
moddi3.c
modsi3.c
modti3.c
muldc3.c
muldf3.c
muldi3.c
mulodi4.c
mulosi4.c
muloti4.c
mulsc3.c
mulsf3.c
multc3.c
multf3.c
multi3.c
mulvdi3.c
mulvsi3.c
mulvti3.c
mulxc3.c
negdf2.c
negdi2.c
negsf2.c
negti2.c
negvdi2.c
negvsi2.c
negvti2.c
os_version_check.c
paritydi2.c
paritysi2.c
parityti2.c
popcountdi2.c
popcountsi2.c
popcountti2.c
powidf2.c
powisf2.c
powitf2.c
powixf2.c
subdf3.c
subsf3.c
subtf3.c
subvdi3.c
subvsi3.c
subvti3.c
trampoline_setup.c
truncdfhf2.c
truncdfsf2.c
truncsfhf2.c
trunctfdf2.c
trunctfsf2.c
ucmpdi2.c
ucmpti2.c
udivdi3.c
udivmoddi4.c
udivmodsi4.c
udivmodti4.c
udivsi3.c
udivti3.c
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winconfig.h
94 lines
2.0 KiB
ArmAsm
94 lines
2.0 KiB
ArmAsm
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/* ===-- clzdi2.c - Implement __clzdi2 -------------------------------------===
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*
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* The LLVM Compiler Infrastructure
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*
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* This file is dual licensed under the MIT and the University of Illinois Open
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* Source Licenses. See LICENSE.TXT for details.
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*
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* ===----------------------------------------------------------------------===
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*
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* This file implements count leading zeros for 64bit arguments.
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*
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* ===----------------------------------------------------------------------===
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*/
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#include "../assembly.h"
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.syntax unified
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.text
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DEFINE_CODE_STATE
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.p2align 2
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DEFINE_COMPILERRT_FUNCTION(__clzdi2)
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#ifdef __ARM_FEATURE_CLZ
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#ifdef __ARMEB__
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cmp r0, 0
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itee ne
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clzne r0, r0
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clzeq r0, r1
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addeq r0, r0, 32
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#else
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cmp r1, 0
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itee ne
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clzne r0, r1
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clzeq r0, r0
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addeq r0, r0, 32
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#endif
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JMP(lr)
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#else
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/* Assumption: n != 0 */
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/*
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* r0: n
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* r1: upper half of n, overwritten after check
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* r1: count of leading zeros in n + 1
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* r2: scratch register for shifted r0
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*/
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#ifdef __ARMEB__
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cmp r0, 0
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moveq r0, r1
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#else
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cmp r1, 0
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movne r0, r1
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#endif
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movne r1, 1
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moveq r1, 33
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/*
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* Basic block:
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* if ((r0 >> SHIFT) == 0)
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* r1 += SHIFT;
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* else
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* r0 >>= SHIFT;
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* for descending powers of two as SHIFT.
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*/
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#define BLOCK(shift) \
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lsrs r2, r0, shift; \
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movne r0, r2; \
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addeq r1, shift \
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BLOCK(16)
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BLOCK(8)
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BLOCK(4)
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BLOCK(2)
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/*
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* The basic block invariants at this point are (r0 >> 2) == 0 and
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* r0 != 0. This means 1 <= r0 <= 3 and 0 <= (r0 >> 1) <= 1.
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*
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* r0 | (r0 >> 1) == 0 | (r0 >> 1) == 1 | -(r0 >> 1) | 1 - (r0 >> 1)
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* ---+----------------+----------------+------------+--------------
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* 1 | 1 | 0 | 0 | 1
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* 2 | 0 | 1 | -1 | 0
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* 3 | 0 | 1 | -1 | 0
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*
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* The r1's initial value of 1 compensates for the 1 here.
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*/
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sub r0, r1, r0, lsr #1
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JMP(lr)
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#endif // __ARM_FEATURE_CLZ
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END_COMPILERRT_FUNCTION(__clzdi2)
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NO_EXEC_STACK_DIRECTIVE
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