Displaying 7 results from an estimated 7 matches for "setnp".
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setne
2008 May 27
3
[LLVMdev] Float compare-for-equality and select optimization opportunity
...a, b, c
if(x == y) // Rotate the integers
{
int t;
t = a;
a = b;
b = c;
c = t;
}
This is the resulting x86 assembly code:
movss xmm0,dword ptr [ecx+4]
ucomiss xmm0,dword ptr [ecx+8]
sete al
setnp dl
test dl,al
mov edx,edi
cmovne edx,ecx
cmovne ecx,esi
cmovne esi,edi
While I'm pleasantly surprised that my branch does get turned into several
select operations as intended (cmov - conditional move - in x86), I'm
confused why it uses th...
2008 May 27
1
[LLVMdev] Float compare-for-equality and select optimizationopportunity
Both ZF and PF will be set if unordered, so the code below is IEEE
correct...you want to generate 'fcmp ueq' instead of 'fcmp oqe'
This is the resulting x86 assembly code:
movss xmm0,dword ptr [ecx+4]
ucomiss xmm0,dword ptr [ecx+8]
sete al
setnp dl
test dl,al
mov edx,edi
cmovne edx,ecx
cmovne ecx,esi
cmovne esi,edi
While I'm pleasantly surprised that my branch does get turned into several
select operations as intended (cmov - conditional move - in x86), I'm
confused why it uses th...
2008 May 27
0
[LLVMdev] Float compare-for-equality and select optimizationopportunity
...portunity
Both ZF and PF will be set if unordered, so the code below is IEEE
correct...you want to generate 'fcmp ueq' instead of 'fcmp oqe'
This is the resulting x86 assembly code:
movss xmm0,dword ptr [ecx+4]
ucomiss xmm0,dword ptr [ecx+8]
sete al
setnp dl
test dl,al
mov edx,edi
cmovne edx,ecx
cmovne ecx,esi
cmovne esi,edi
While I'm pleasantly surprised that my branch does get turned into several
select operations as intended (cmov - conditional move - in x86), I'm
confused why it uses th...
2008 May 27
1
[LLVMdev] Float compare-for-equality andselect optimizationopportunity
...portunity
Both ZF and PF will be set if unordered, so the code below is IEEE
correct...you want to generate 'fcmp ueq' instead of 'fcmp oqe'
This is the resulting x86 assembly code:
movss xmm0,dword ptr [ecx+4]
ucomiss xmm0,dword ptr [ecx+8]
sete al
setnp dl
test dl,al
mov edx,edi
cmovne edx,ecx
cmovne ecx,esi
cmovne esi,edi
While I'm pleasantly surprised that my branch does get turned into several
select operations as intended (cmov - conditional move - in x86), I'm
confused why it uses th...
2009 Jan 13
0
[LLVMdev] Crash when using InstallLazyFunctionCreator and JIT on Linux x64.
...00007f45ef2b6018: sub $0x8,%rsp
0x00007f45ef2b601c: mov $0x7f45ef2b6010,%rax
0x00007f45ef2b6026: movss (%rax,%riz,1),%xmm0
0x00007f45ef2b602b: movss %xmm0,0x4(%rsp)
0x00007f45ef2b6031: callq 0x7f46005ce64e
0x00007f45ef2b6036: ucomiss 0x4(%rsp),%xmm0
0x00007f45ef2b603b: setnp %cl
0x00007f45ef2b603e: sete %al
0x00007f45ef2b6041: and %cl,%al
0x00007f45ef2b6043: add $0x8,%rsp
0x00007f45ef2b6047: retq
As you can see, the upper 32 bits of the function address that the
function is making a call to are incorrect.
Consequently, the program makes an inva...
2013 Jul 19
0
[LLVMdev] llvm.x86.sse2.sqrt.pd not using sqrtpd, calling a function that modifies ECX
...0,xmm0
002E053D movapd xmm2,xmm3
002E0541 movapd xmm6,xmm3
002E0545 addsd xmm2,xmm0
002E0549 movapd xmm3,xmmword ptr [esp+0B0h]
002E0552 addsd xmm2,xmm3
002E0556 movapd xmm7,xmm3
002E055A xorpd xmm3,xmm3
002E055E ucomisd xmm2,xmm3
002E0562 setnp al
002E0565 sete cl
002E0568 test al,cl
002E056A jne 002E059A
002E0570 movapd xmm5,xmmword ptr [esp+0C0h]
002E0579 movapd xmm2,xmm5
002E057D addpd xmm2,xmm1
002E0581 mulpd xmm1,xmm1
002E0585 mulpd xmm5,xmm5
002E0589 addpd...
2013 Jul 19
4
[LLVMdev] SIMD instructions and memory alignment on X86
Hmm, I'm not able to get those .ll files to compile if I disable SSE and I
end up with SSE instructions(including sqrtpd) if I don't disable it.
On Thu, Jul 18, 2013 at 10:53 PM, Peter Newman <peter at uformia.com> wrote:
> Is there something specifically required to enable SSE? If it's not
> detected as available (based from the target triple?) then I don't think