[Bug target/79185] [8 Regression] register allocation in the addition of two 128/9 bit ints

[drraph at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79185

--- Comment #17 from Raphael C  ---
Tested in gcc 11.1 with -O2

ai(__int128, __int128):
mov r9, rdi
mov rax, rdx
mov r8, rsi
mov rdx, rcx
add rax, r9
adc rdx, r8
ret


This looks like two more mov's than needed but I may be wrong.

By contrast clang gives

ai(__int128, __int128):  
mov rax, rdi
add rax, rdx
adc rsi, rcx
mov rdx, rsi
ret

[Bug target/79185] [8 Regression] register allocation in the addition of two 128/9 bit ints

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79185

Jakub Jelinek  changed:

   What|Removed |Added

   Target Milestone|8.5 |9.0
 Status|NEW |RESOLVED
 Resolution|--- |FIXED

--- Comment #16 from Jakub Jelinek  ---
8 branch is being closed, fixed in 9.0.

[Bug target/79185] [8 Regression] register allocation in the addition of two 128/9 bit ints

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79185

Jakub Jelinek  changed:

   What|Removed |Added

   Target Milestone|8.4 |8.5

--- Comment #15 from Jakub Jelinek  ---
GCC 8.4.0 has been released, adjusting target milestone.