Displaying 6 results from an estimated 6 matches for "_f2".
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2011 Dec 14
2
[LLVMdev] Failure to optimize ? operator
... 8(%ebp), %edx testl %edx, %edx
jle L5 popl %ebp ret .p2align 4,,7L5:
movl %edx, %ecx imull %edx, %ecx popl %ebp
leal 3(%ecx,%ecx,4), %eax imull %edx, %eax
leal 1(%eax,%ecx,2), %eax ret .p2align 4,,15
_f2:
pushl %ebp xorl %eax, %eax movl %esp,
%ebp movl 8(%ebp), %edx testl %edx, %edx jle
L9 popl %ebp ret .p2align 4,,7L9:
movl %edx, %ecx imull %edx, %ecx popl %ebp
leal 3(%ecx,%ecx,4), %eax ...
2018 Apr 02
1
const struct auto vs. static
...obably mark some of our functions to not be inlined.
$ cat 3.c
void f2(const void*);
void f1()
{
const struct { int a; } b = { 0 };
f2(&b);
}
$ clang -c -S 3.c
$ cat 3.s
_f1: ## @f1
pushq %rbp
movq %rsp, %rbp
leaq _f1.b(%rip), %rax
movq %rax, %rdi
callq _f2
popq %rbp
retq
$ clang --version
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
Thank you,
- Jay
2018 Apr 05
2
double to unsigned char cast
...Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
$ clang -arch arm64 -O2 -S -c /s/1.c && more 1.s
_f1:
fcvtzs w0, d0
ret
_f2:
fcvtzs w8, d0
and w0, w8, #0xff
ret
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2011 Dec 14
0
[LLVMdev] Failure to optimize ? operator
On Tue, Dec 13, 2011 at 5:59 AM, Brent Walker <brenthwalker at gmail.com> wrote:
> The following seemingly identical functions, get compiled to quite
> different machine code. The first is correctly optimized (the
> computation of var y is nicely moved into the else branch of the "if"
> statement), which the second one is not (the full computation of var y
> is
2011 Dec 13
4
[LLVMdev] Failure to optimize ? operator
The following seemingly identical functions, get compiled to quite
different machine code. The first is correctly optimized (the
computation of var y is nicely moved into the else branch of the "if"
statement), which the second one is not (the full computation of var y
is always done). The output was produced using the demo page on
llvm's web site (optimization level LTO).
Can
2008 Jun 30
4
Rebuild of kernel 2.6.9-67.0.20.EL failure
Hello list.
I'm trying to rebuild the 2.6.9.67.0.20.EL kernel, but it fails even without
modifications.
How did I try it?
Created a (non-root) build environment (not a mock )
Installed the kernel.scr.rpm and did a
rpmbuild -ba --target=`uname -m` kernel-2.6.spec 2> prep-err.log | tee
prep-out.log
The build failed at the end:
Processing files: kernel-xenU-devel-2.6.9-67.0.20.EL
Checking