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llvm-6502/test/CodeGen/X86/break-sse-dep.ll

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Add mcpu to tests to prevent them from using AVX instructions on Sandy Bridge after r155618. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155696 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-27 07:11:58 +00:00
; RUN: llc < %s -mtriple=x86_64-linux -mattr=+sse2 -mcpu=nehalem | FileCheck %s
; RUN: llc < %s -mtriple=x86_64-win32 -mattr=+sse2 -mcpu=nehalem | FileCheck %s
On recent Intel u-arch's, folding loads into some unary SSE instructions can be non-optimal. To be precise, we should avoid folding loads if the instructions only update part of the destination register, and the non-updated part is not needed. e.g. cvtss2sd, sqrtss. Unfolding the load from these instructions breaks the partial register dependency and it can improve performance. e.g. movss (%rdi), %xmm0 cvtss2sd %xmm0, %xmm0 instead of cvtss2sd (%rdi), %xmm0 An alternative method to break dependency is to clear the register first. e.g. xorps %xmm0, %xmm0 cvtss2sd (%rdi), %xmm0 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91672 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-18 07:40:29 +00:00
define double @t1(float* nocapture %x) nounwind readonly ssp {
entry:
Remove target attribute break-sse-dep. Instead, do not fold load into sse partial update instructions unless optimizing for size. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91910 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-22 17:47:23 +00:00
; CHECK: t1:
Relax expressions and add explicit triplets -linux and -win32. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126197 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-22 07:19:20 +00:00
; CHECK: movss ([[A0:%rdi|%rcx]]), %xmm0
Fix some tests that didn't test anything. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106954 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-26 20:05:06 +00:00
; CHECK: cvtss2sd %xmm0, %xmm0
On recent Intel u-arch's, folding loads into some unary SSE instructions can be non-optimal. To be precise, we should avoid folding loads if the instructions only update part of the destination register, and the non-updated part is not needed. e.g. cvtss2sd, sqrtss. Unfolding the load from these instructions breaks the partial register dependency and it can improve performance. e.g. movss (%rdi), %xmm0 cvtss2sd %xmm0, %xmm0 instead of cvtss2sd (%rdi), %xmm0 An alternative method to break dependency is to clear the register first. e.g. xorps %xmm0, %xmm0 cvtss2sd (%rdi), %xmm0 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91672 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-18 07:40:29 +00:00
%0 = load float* %x, align 4
%1 = fpext float %0 to double
ret double %1
}
Remove target attribute break-sse-dep. Instead, do not fold load into sse partial update instructions unless optimizing for size. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91910 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-22 17:47:23 +00:00
define float @t2(double* nocapture %x) nounwind readonly ssp optsize {
On recent Intel u-arch's, folding loads into some unary SSE instructions can be non-optimal. To be precise, we should avoid folding loads if the instructions only update part of the destination register, and the non-updated part is not needed. e.g. cvtss2sd, sqrtss. Unfolding the load from these instructions breaks the partial register dependency and it can improve performance. e.g. movss (%rdi), %xmm0 cvtss2sd %xmm0, %xmm0 instead of cvtss2sd (%rdi), %xmm0 An alternative method to break dependency is to clear the register first. e.g. xorps %xmm0, %xmm0 cvtss2sd (%rdi), %xmm0 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91672 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-18 07:40:29 +00:00
entry:
Remove target attribute break-sse-dep. Instead, do not fold load into sse partial update instructions unless optimizing for size. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91910 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-22 17:47:23 +00:00
; CHECK: t2:
Relax expressions and add explicit triplets -linux and -win32. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126197 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-22 07:19:20 +00:00
; CHECK: cvtsd2ss ([[A0]]), %xmm0
On recent Intel u-arch's, folding loads into some unary SSE instructions can be non-optimal. To be precise, we should avoid folding loads if the instructions only update part of the destination register, and the non-updated part is not needed. e.g. cvtss2sd, sqrtss. Unfolding the load from these instructions breaks the partial register dependency and it can improve performance. e.g. movss (%rdi), %xmm0 cvtss2sd %xmm0, %xmm0 instead of cvtss2sd (%rdi), %xmm0 An alternative method to break dependency is to clear the register first. e.g. xorps %xmm0, %xmm0 cvtss2sd (%rdi), %xmm0 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91672 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-18 07:40:29 +00:00
%0 = load double* %x, align 8
%1 = fptrunc double %0 to float
ret float %1
}
Apply the SSE dependence idiom for SSE unary operations to SD instructions too, in addition to SS instructions. And add a comment about it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108191 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-12 20:46:04 +00:00
define float @squirtf(float* %x) nounwind {
entry:
; CHECK: squirtf:
Relax expressions and add explicit triplets -linux and -win32. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126197 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-22 07:19:20 +00:00
; CHECK: movss ([[A0]]), %xmm0
Apply the SSE dependence idiom for SSE unary operations to SD instructions too, in addition to SS instructions. And add a comment about it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108191 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-12 20:46:04 +00:00
; CHECK: sqrtss %xmm0, %xmm0
%z = load float* %x
%t = call float @llvm.sqrt.f32(float %z)
ret float %t
}
define double @squirt(double* %x) nounwind {
entry:
; CHECK: squirt:
X86 Peephole: fold loads to the source register operand if possible. Machine CSE and other optimizations can remove instructions so folding is possible at peephole while not possible at ISel. This patch is a rework of r160919 and was tested on clang self-host on my local machine. rdar://10554090 and rdar://11873276 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161152 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-02 00:56:42 +00:00
; CHECK: sqrtsd ([[A0]]), %xmm0
Apply the SSE dependence idiom for SSE unary operations to SD instructions too, in addition to SS instructions. And add a comment about it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108191 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-12 20:46:04 +00:00
%z = load double* %x
%t = call double @llvm.sqrt.f64(double %z)
ret double %t
}
define float @squirtf_size(float* %x) nounwind optsize {
entry:
; CHECK: squirtf_size:
Relax expressions and add explicit triplets -linux and -win32. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126197 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-22 07:19:20 +00:00
; CHECK: sqrtss ([[A0]]), %xmm0
Apply the SSE dependence idiom for SSE unary operations to SD instructions too, in addition to SS instructions. And add a comment about it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108191 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-12 20:46:04 +00:00
%z = load float* %x
%t = call float @llvm.sqrt.f32(float %z)
ret float %t
}
define double @squirt_size(double* %x) nounwind optsize {
entry:
; CHECK: squirt_size:
Relax expressions and add explicit triplets -linux and -win32. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126197 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-22 07:19:20 +00:00
; CHECK: sqrtsd ([[A0]]), %xmm0
Apply the SSE dependence idiom for SSE unary operations to SD instructions too, in addition to SS instructions. And add a comment about it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108191 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-12 20:46:04 +00:00
%z = load double* %x
%t = call double @llvm.sqrt.f64(double %z)
ret double %t
}
declare float @llvm.sqrt.f32(float)
declare double @llvm.sqrt.f64(double)
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