如何解决就机器代码而言，GCC、clang 和/或 LLVM 中实现的架构支持在哪里？
我在看this：
Architecture characteristic key
-----------------------------------------------------------------------
H A hardware implementation does not exist.
M A hardware implementation is not currently being manufactured.
S A Free simulator does not exist.
L Integer registers are narrower than 32 bits.
Q Integer registers are at least 64 bits wide.
N Memory is not byte addressable,and/or bytes are not eight bits.
F Floating point arithmetic is not included in the instruction set
I Architecture does not use IEEE format floating point numbers
C Architecture does not have a single condition code register.
B Architecture has delay slots.
D Architecture has a stack that grows upward.
l Port cannot use ILP32 mode integer arithmetic.
q Port can use LP64 mode integer arithmetic.
r Port can switch between ILP32 and LP64 at runtime.
(Not necessarily supported by all subtargets.)
c Port uses cc0.
p Port uses define_peephole (as opposed to define_peephole2).
b Port uses '"* ..."' notation for output template code.
f Port does not define prologue and/or epilogue RTL expanders.
m Port does not use define_constants.
g Port does not define TARGET_ASM_FUNCTION_(PRO|EPI)LOGUE.
i Port generates multiple inheritance thunks using
TARGET_ASM_OUTPUT_MI(_VCALL)_THUNK.
a Port uses LRA (by default,i.e. unless overridden by a switch).
t All insns either produce exactly one assembly instruction,or
trigger a define_split.
e <arch>-elf is not a supported target.
s <arch>-elf is the correct target to use with the simulator
in /cvs/src.
| characteristics
Target | HMSLQNFICBD lqrcpbfmgiates
-----------+---------------------------
aarch64 | Q q b gia s
alpha | ? Q C q mgi e
arc | B b gia
arm | b ia s
avr | L FI l cp g
bfin | F gi
c6x | S CB gi
cr16 | L F C c g s
cris | F B gi s
csky | b ia
epiphany | C gi s
fr30 | ?? FI B pb mg s
frv | ?? B b i s
gcn | S C D q a e
h8300 | FI B g s
i386 | Q q b ia
ia64 | ? Q C qr b m i
iq2000 | ??? FICB b g t
lm32 | F g
m32c | L FI l b g s
m32r | FI b s
m68k | pb i
mcore | ? FI pb mg s
mep | F C b g t s
microblaze | CB i s
mips | Q CB qr ia s
mmix | HM Q C q i e
mn10300 | ?? gi s
moxie | F g t s
msp430 | L FI l b g s
nds32 | F C ia s
nios2 | C ia
nvptx | S Q C q mg e
pa | Q CBD qr b i e
pdp11 | L IC qr b e
powerpcspe | Q C qr pb ia
pru | L F a s
riscv | Q C qr gia
rl78 | L F l g s
rs6000 | Q C qr pb ia
rx | s
s390 | Q qr gia e
sh | Q CB qr p i
sparc | Q CB qr b ia
stormy16 | ???L FIC D l b i
tilegx | Q C q gi e
tilepro | S F C gi e
v850 | g a s
vax | M I b i e
visium | B g t s
xtensa | C
这看起来大约有 50 个架构。在 GitHub 上的源代码中实现的所有内容在哪里？对于 GCC、clang 和/或 LLVM（或任何其他可能对实现架构集成感兴趣的关键项目）。
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