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* [Bug target/79185] [8 Regression] register allocation in the addition of two 128/9 bit ints
[not found] <bug-79185-4@http.gcc.gnu.org/bugzilla/>
@ 2021-05-14 10:10 ` jakub at gcc dot gnu.org
2021-06-11 10:05 ` drraph at gmail dot com
1 sibling, 0 replies; 2+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-05-14 10:10 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79185
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|8.5 |9.0
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
8 branch is being closed, fixed in 9.0.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug target/79185] [8 Regression] register allocation in the addition of two 128/9 bit ints
[not found] <bug-79185-4@http.gcc.gnu.org/bugzilla/>
2021-05-14 10:10 ` [Bug target/79185] [8 Regression] register allocation in the addition of two 128/9 bit ints jakub at gcc dot gnu.org
@ 2021-06-11 10:05 ` drraph at gmail dot com
1 sibling, 0 replies; 2+ messages in thread
From: drraph at gmail dot com @ 2021-06-11 10:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79185
--- Comment #17 from Raphael C <drraph at gmail dot com> ---
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
^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <bug-79185-4@http.gcc.gnu.org/bugzilla/>
2021-05-14 10:10 ` [Bug target/79185] [8 Regression] register allocation in the addition of two 128/9 bit ints jakub at gcc dot gnu.org
2021-06-11 10:05 ` drraph at gmail dot com
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