lib/Target/X86/README-FPStack.txt File Reference

Functions
Some	targets (e.g. athlons) prefer freep to fstp ST(0)
foo esp	movsd (%esp)
foo esp xmm0 movsd esp	fldl (%esp) fisttpll(%esp) movl(%esp)

Variables
We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def	FpADD32m
We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def	RFP
We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def	f32mem
We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def	OneArgFPRW
We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def	FpIADD32m
We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def	i32mem
We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def The FP stackifier should handle simple permutates to reduce number of shuffle	instructions
We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def The FP stackifier should handle simple permutates to reduce number of shuffle e g	turning
We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def The FP stackifier should handle simple permutates to reduce number of shuffle e g	floor
We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def The FP stackifier should handle simple permutates to reduce number of shuffle e g	ceil
We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def The FP stackifier should handle simple permutates to reduce number of shuffle e g	trunc
We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def The FP stackifier should handle simple permutates to reduce number of shuffle e g which prevents the spiller from folding spill code into the instructions Currently the x86 codegen isn t very good at mixing SSE and FPStack	code
foo	__pad0__
foo esp xmm0 movsd	xmm0
foo esp xmm0 movsd esp eax	addl

Function Documentation

fldl()

foo esp xmm0 movsd esp fldl

(

%

esp

)

movsd()

foo esp movsd

(

%

esp

)

targets()

Some targets

(

e.g.

athlons

)

Definition at line 7 of file README-FPStack.txt.

References I, and P.

Variable Documentation

__pad0__

foo __pad0__

Definition at line 74 of file README-FPStack.txt.

addl

gets compiled into this on rsp movaps rsp movaps rsp movaps rsp movaps rsp movaps rsp movaps rsp movaps rsp movaps rsp movq rsp movq rsp movq rsp movq rsp movq rsp rax movq rsp rax movq rsp rsp rsp eax eax jbe LBB1_3 rcx rax movq rsp eax rsp ret ecx eax rcx movl rsp jmp LBB1_2 gcc rsp rax movq rsp rsp movq rsp rax movq rsp eax eax jb L6 rdx eax rsp ret p2align edx rdx eax movl rsp eax rsp ret and it gets compiled into this on ebp esp eax movl ebp eax movl ebp eax addl

Definition at line 80 of file README-FPStack.txt.

ceil

We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def The FP stackifier should handle simple permutates to reduce number of shuffle e g ceil

Definition at line 54 of file README-FPStack.txt.

Referenced by areRuntimeChecksProfitable(), llvm::canConstantFoldCallTo(), llvm::symbolize::SourceCode::format(), getBranchWeight(), llvm::getIntrinsicForCallSite(), llvm::RISCVTTIImpl::getIntrinsicInstrCost(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getTypeBasedIntrinsicInstrCost(), isIdempotent(), llvm::isKnownNeverNaN(), llvm::ARMTTIImpl::isLoweredToCall(), llvm::isTriviallyVectorizable(), llvm::IntrinsicLowering::LowerIntrinsicCall(), removesFPFraction(), setGroupSize(), simplifyNvvmIntrinsic(), tryInterleave(), llvm::InstCombinerImpl::visitCallInst(), and llvm::InstCombinerImpl::visitFPTrunc().

code

We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def The FP stackifier should handle simple permutates to reduce number of shuffle e g which prevents the spiller from folding spill code into the instructions Currently the x86 codegen isn t very good at mixing SSE and FPStack code

Definition at line 71 of file README-FPStack.txt.

f32mem

We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def f32mem

Definition at line 18 of file README-FPStack.txt.

floor

We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def The FP stackifier should handle simple permutates to reduce number of shuffle e g floor

Definition at line 54 of file README-FPStack.txt.

Referenced by llvm::canConstantFoldCallTo(), llvm::getIntrinsicForCallSite(), llvm::RISCVTTIImpl::getIntrinsicInstrCost(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getTypeBasedIntrinsicInstrCost(), isIdempotent(), llvm::isKnownNeverNaN(), llvm::ARMTTIImpl::isLoweredToCall(), llvm::isTriviallyVectorizable(), llvm::IntrinsicLowering::LowerIntrinsicCall(), removesFPFraction(), simplifyNvvmIntrinsic(), tryInterleave(), llvm::InstCombinerImpl::visitCallInst(), and llvm::InstCombinerImpl::visitFPTrunc().

FpADD32m

We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def FpADD32m

Definition at line 18 of file README-FPStack.txt.

FpIADD32m

We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def FpIADD32m

Definition at line 20 of file README-FPStack.txt.

i32mem

We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def i32mem

Definition at line 23 of file README-FPStack.txt.

instructions

We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def The FP stackifier should handle simple permutates to reduce number of shuffle instructions

Definition at line 25 of file README-FPStack.txt.

OneArgFPRW

We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def OneArgFPRW

Definition at line 18 of file README-FPStack.txt.

RFP

We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def RFP

Definition at line 18 of file README-FPStack.txt.

trunc

We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def The FP stackifier should handle simple permutates to reduce number of shuffle e g trunc

Definition at line 63 of file README-FPStack.txt.

Referenced by llvm::canConstantFoldCallTo(), llvm::getIntrinsicForCallSite(), llvm::RISCVTTIImpl::getIntrinsicInstrCost(), llvm::BasicTTIImplBase< AMDGPUTTIImpl >::getTypeBasedIntrinsicInstrCost(), isIdempotent(), llvm::isKnownNeverNaN(), llvm::ARMTTIImpl::isLoweredToCall(), llvm::isTriviallyVectorizable(), llvm::IntrinsicLowering::LowerIntrinsicCall(), removesFPFraction(), simplifyNvvmIntrinsic(), tryInterleave(), llvm::InstCombinerImpl::visitCallInst(), and llvm::InstCombinerImpl::visitFPTrunc().

turning

We have fiadd patterns now but the followings have the same cost and complexity We need a way to specify the later is more profitable def def The FP stackifier should handle simple permutates to reduce number of shuffle e g turning

Definition at line 54 of file README-FPStack.txt.

xmm0

foo esp xmm0 movsd xmm0

Definition at line 76 of file README-FPStack.txt.