https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80817
--- Comment #3 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch>
---
If I compile with -m32
gcc -std=c++11 -m32 -S -O3 test.cpp
I get
.cfi_startproc
subl $12, %esp
.cfi_def_cfa_offset 16
movl 16(%esp), %ecx
fildq (%ecx)
fistpq (%esp)
movl (%esp), %eax
movl 4(%esp), %edx
addl $1, %eax
adcl $0, %edx
movl %eax, (%esp)
movl %edx, 4(%esp)
fildq (%esp)
fistpq (%ecx)
addl $12, %esp
.cfi_def_cfa_offset 4
ret
.cfi_endproc
Is the above expected ? This causes a measurable slowdown in the piece of code
I'm looking at.
