https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94846
Gabriel Ravier <gabravier at gmail dot com> changed:
What |Removed |Added
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Target|x86_64-* i?86-*-* |
--- Comment #1 from Gabriel Ravier <gabravier at gmail dot com> ---
Some extra notes :
This also occurs on i?86.
This is the LLVM output :
f(unsigned int*, unsigned int): # @f(unsigned int*, unsigned int)
mov ecx, dword ptr [esp + 4]
mov eax, dword ptr [ecx]
add eax, dword ptr [esp + 8]
adc eax, 0
mov dword ptr [ecx], eax
ret
This is the GCC output :
f(unsigned int*, unsigned int):
mov edx, DWORD PTR [esp+4]
mov eax, DWORD PTR [edx]
add eax, DWORD PTR [esp+8]
jnc .L6
add eax, 1
.L6:
mov DWORD PTR [edx], eax
ret
This also occurs on aarch64.
This is the LLVM output :
f(unsigned int*, unsigned int): // @f(unsigned int*, unsigned int)
ldr w8, [x0]
adds w8, w8, w1
cinc w8, w8, hs
str w8, [x0]
mov w0, w8
ret
This is the GCC output (as of GCC 9.2, didn't have the time to check GCC 10 for
aarch64 ) :
f:
ldr w2, [x0]
mov x3, x0
adds w0, w2, w1
bcc .L6
add w0, w0, 1
.L6:
str w0, [x3]
ret
