search for: fsqrt

...fabsf() so for me this is unimportant ... > 2. Codegen fsin/fcos to fsin/fcos for X86. We cannot do this, except > under the control of something like -enable-unsafe-fp-math. These > instructions are architected to have a limited range. OK, I will add this flag. > 3. Codegen fsqrt/fsqrtf C functions to the FSQRT dag node. These > functions can set errno, so this is not a safe transformation. The > proper way to do this is to introduce an llvm.sqrt.f32/llvm.sqrt.f64 > pair of intrinsics to represent these operations without errno. The > optimizer ca...

...25890.html http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20050425/025891.html http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20050425/025892.html Add fabs/fabsf support to x86 isel simple: http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20050425/025893.html Add fsqrt support to x86 pattern isel: http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20050425/025896.html New X86 instrs: http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20050425/025894.html The patches I didn't apply are these: 1. Match (Y < 0) ? -Y : Y -> FABS in the Se...

Hello, I have been gone for a while, finishing work on my Master's thesis... Now that I'm back I updated LLVM to the most recent version and found that my FP_ABS SelectionDAGNode type and code generation was now conflicting with the new FABS node type. I brought the rest of my local modifications in line with the FABS implementation, so here is my patch that includes sqrt, sin and cos

...wever, if I call exp() on the C side, I don't see the expf opcode show up on the generated assembly, I see a call to an exp function from libm. Here's what we've got in our TargetInstrinfo.td file for both of these instructions: def SQRTF64 : Other2ROp< 0b0001101, "sqrtF", fsqrt, OpInfo_F64, II_ELEMF3 >; def SQRTF32 : Other2ROp< 0b0001101, "sqrtF", fsqrt, OpInfo_F32, II_ELEMF1 >; def EXPF64 : Other2ROp< 0b0001010, "expF", fexp2, OpInfo_F64, II_ELEMF3 >; def EXPF32 : Other2ROp< 0b0001010, "expF", fexp2, OpInfo_F32, II_ELE...

sqrtf is detected by code in SelectionDAGBuilder.cpp. This gets turns into a FSQRT ISD node type that the target can handle just like any other ISD node. If the target doesn't mark ISD::FSQRT as Legal or Custom then ExpandNode in LegalizeDAG.cpp turns it back into a sqrtf libcall. On Sun, Jan 20, 2013 at 11:34 AM, David Given <dg at cowlark.com> wrote: > On 20/01/1...

...4.18s (gcc -Wall -O3 -lm ray.c -o ray) llvm-gcc 4.2.1: 5.00s (llvm-gcc -O3 -march=opteron -msse2 -lm ray.c -o ray) Note that the LLVM-generated code is 60% slower than GCC's in the first case. I am unfamiliar with x86 assembler but I believe the problem is that LLVM is calling a function for fsqrt rather than using the x86 op-code. Should I be passing some command line arguments or using a newer llvm-gcc to get it to emit fsqrt or is that not yet implemented? Benchmark was: time ./ray 9 512 >image.pgm Compile times go down from 0.36s to 0.13s on x86 and 0.35s to 0.19s on x86-64 as...

On 20/01/13 19:20, Caldarale, Charles R wrote: [...] > That's because there is no llvm.ceil.* intrinsic defined in include/llvm/Intrinsics.td for 3.2 Ah. Yes, that would explain it... does this mean that I can rely on all the intrinsics listed existing for the common types (int, float, double)? Or should I be trying to follow the libc call route? I've noticed that llc is successfully

FYI. http://leonardo-m.livejournal.com/73732.html If anyone is motivated, please file bugs for the losing cases. Also, it might make sense to incorporate the tests into our nightly tester test suite. Thanks, Evan

...t with a sqrtsd instruction inline. It turns out that it could do exactly that, were it not for the fact that in the function visitUnaryFloatCall() at line 5514 in SelectionDAGBuilder.cpp, the result of !I.onlyReadsMemory() Is true, so the code is unable to replace the function call with an ISD::FSQRT SDNode. If I remove the above test, then the compiler will emit a sqrtsd instruction. I am hoping that someone might be able to comment on what onlyReadsMemory is supposed to do be doing in general and why it is returning false in this case. Thanks! Preston -- Preston Gurd <preston.gurd at i...

MipsOptimizeMathLibCalls.cpp converts: g = sqrt (f); into: r1 = sqrt (f) readonly; if (g is a NaN) r2 = sqrt (f); g = phi (r1, r2) I'd like to do the same on z. Would it be OK to make this pass generic and do the transformation whenever FSQRT isLegalOrCustom for the type? If so, should it stay a separate pass, or should I merge it with something else? Thanks, Richard

...6, at 7:49 AM, Ryan Taylor via llvm-dev < >> llvm-dev at lists.llvm.org> wrote: >> >> given the following C code: >> >> float b=16, a=0; >> int main() { >> float a = sqrt(b); >> return0; >> } >> >> I'm trying to lower FSQRT down, but getting a casting issue, my code is: >> >> SDValue XXXLowering::LowerFSQRT(SDValue Op, SelectionDAG &DAG) const { >> SDLoc DL(Op); >> EVT VT = Op.getValueType(); >> SDValue LHS = Op.getOperand(0); >> >> SDValue newNode = DAG.getNod...

...ving as I expected. Example: // For scalar unary operations, fold a load into the operation // only in OptForSize mode. It eliminates an instruction, but it also // eliminates a whole-register clobber (the load), so it introduces a // partial register update condition. def : Pat<(f32 (fsqrt (load addr:$src))), (VSQRTSSm (f32 (IMPLICIT_DEF)), addr:$src)>, Requires<[HasAVX, OptForSize]>; This is generated: vsqrtss (%rdi), %xmm0, %xmm0 regardless of whether I specify -Os or -O1 with clang. -------------- next part -------------- An HTML attachmen...

...the 2.8 release. I added code to emit an fneg assembly instruction and now I'm getting "UNREACHABLE executed!" when trying to compile the code. The only change I made was to add the following two lines next to the square root lines in the code (FPU and sqrt are enabled in llc): def FSQRT : ArithF2<0x16, 0x300, "fsqrt ", IIAlu>; def FNEG : ArithF2<0x16, 0x300, "fneg ", IIAlu>; // added for fneg and def : Pat<(fsqrt FGR32:$V), (FSQRT FGR32:$V)>; def : Pat<(fneg FGR32:$V), (FNEG FGR32:$V)>; // added for fneg Does anyone know w...

...86-pc-mingw sqrt.s The output format is file format ELF32-i386, i wanna to know is there a way to output COFF format along with target=i686-pc-mingw. because I want to compile to following asm file for both linux/gcc and windows/visual C++. .global sqrt .type sqrt, at function sqrt: fldl 4(%esp) fsqrt fstsw %ax sub $12,%esp fld %st(0) fstpt (%esp) mov (%esp),%ecx and $0x7ff,%ecx cmp $0x400,%ecx jnz 1f and $0x200,%eax sub $0x100,%eax sub %eax,(%esp) fstp %st(0) fldt (%esp) 1: add $12,%esp fstpl 4(%esp) fldl 4(%esp) ret > > Cheers, > Rafael -- 此致 礼 罗勇刚 Yours sincerely, Y...

...thLibCalls.cpp converts: > > g = sqrt (f); > > into: > > r1 = sqrt (f) readonly; > if (g is a NaN) > r2 = sqrt (f); > g = phi (r1, r2) > > I'd like to do the same on z. Would it be OK to make this pass generic > and do the transformation whenever FSQRT isLegalOrCustom for the type? > > If so, should it stay a separate pass, or should I merge it with > something else? > > Thanks, > Richard > > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs...

...e. > > It turns out that it could do exactly that, were it not for the fact that in the function visitUnaryFloatCall() at line 5514 in SelectionDAGBuilder.cpp, the result of > > !I.onlyReadsMemory() > > Is true, so the code is unable to replace the function call with an ISD::FSQRT SDNode. If I remove the above test, then the compiler will emit a sqrtsd instruction. > > I am hoping that someone might be able to comment on what onlyReadsMemory is supposed to do be doing in general and why it is returning false in this case. > The compiler is being conservative ab...

2) For lag in execution time due to floating point operations, it was clearly observed that gcc used floating point instruction FSQRT, where as clang seemed to use emulated function (?) BL SQRT. Note that we used the following flags for both clang as well as gcc compilation. -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -mtune=cortex-a8 Infact, i was surprised to see that even when " -march=armv7-a -mfloat-abi=hard...

...int, not a float. —escha > On Jun 24, 2016, at 7:49 AM, Ryan Taylor via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > given the following C code: > > float b=16, a=0; > int main() { > float a = sqrt(b); > return0; > } > > I'm trying to lower FSQRT down, but getting a casting issue, my code is: > > SDValue XXXLowering::LowerFSQRT(SDValue Op, SelectionDAG &DAG) const { > SDLoc DL(Op); > EVT VT = Op.getValueType(); > SDValue LHS = Op.getOperand(0); > > SDValue newNode = DAG.getNode(ISD::INTRINSIC_WO_CHAIN,...

...is file format ELF32-i386, i wanna to know > is there a way to output COFF format along with target=i686-pc-mingw. > because I want to compile to following asm file for both linux/gcc and > windows/visual C++. > > .global sqrt > .type sqrt, at function > sqrt: fldl 4(%esp) > fsqrt > fstsw %ax > sub $12,%esp > fld %st(0) > fstpt (%esp) > mov (%esp),%ecx > and $0x7ff,%ecx > cmp $0x400,%ecx > jnz 1f > and $0x200,%eax > sub $0x100,%eax > sub %eax,(%esp) > fstp %st(0) > fldt (%esp) > 1: add $12,%esp > fstpl 4(%esp) > fldl 4(%esp) &g...

...time than clang, when same libc.so.6 & ld-linux.so.3 were being used for both executables generated by gcc & clang executions. What could be the possible reason ? 2) For lag in execution time due to floating point operations, it was clearly observed that gcc used floating point instruction FSQRT, where as clang seemed to use emulated function (?) BL SQRT. Note that we used the following flags for both clang as well as gcc compilation. -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -mtune=cortex-a8 Infact, i was surprised to see that even when " -march=armv7-a -mfloat-abi= *hard* -...