On Wednesday, 23 October 2019 at 13:08:34 UTC, Per Nordlöw wrote:
The ASM- and IR-output from the following code is pretty messy
for
You call this messy?!
cmpq %rdi, %rdx
jae .LBB0_2
xorl %eax, %eax
retq
.LBB0_2:
movq %rdi, %rax
testq %rdi, %rdi
je .LBB0_3
pushq %rax
.cfi_def_cfa_offset 16
movq %rcx, %rdi
movq %rax, %rdx
callq memcmp@PLT
testl %eax, %eax
sete %al
addq $8, %rsp
.cfi_def_cfa_offset 8
retq
.LBB0_3:
movb $1, %al
retq
Anyway, clearly no bounds checks, LLVM's optimizer works as it
should.
