Should be RNDD, please see the difference between the two definitions below:
Libm trunk(): These functions round x to the nearest integer not larger in *absolute* value. Llvm.trunc: The ‘llvm.trunc.*‘ intrinsics returns the operand rounded to the nearest integer not larger in magnitude than the operand. > -----Original Message----- > From: Beignet [mailto:[email protected]] On Behalf Of > Song, Ruiling > Sent: Friday, January 16, 2015 10:36 AM > To: Luo, Xionghu; [email protected] > Cc: Luo, Xionghu > Subject: Re: [Beignet] [PATCH v2] fix llvm.trunc.float instruction bug. > > Should be RNDZ. The llvm.trunc is same as libm trunc(), which means rounding > toward zero. > > > -----Original Message----- > > From: Beignet [mailto:[email protected]] On Behalf > > Of [email protected] > > Sent: Thursday, January 15, 2015 7:05 PM > > To: [email protected] > > Cc: Luo, Xionghu > > Subject: [Beignet] [PATCH v2] fix llvm.trunc.float instruction bug. > > > > From: Luo <[email protected]> > > > > float to float trunc should use RNDU IR instruction. > > > > v2: fix typo. should be RNDD instead of RNDU. > > Signed-off-by: Luo <[email protected]> > > --- > > backend/src/llvm/llvm_gen_backend.cpp | 4 +--- > > 1 file changed, 1 insertion(+), 3 deletions(-) > > > > diff --git a/backend/src/llvm/llvm_gen_backend.cpp > > b/backend/src/llvm/llvm_gen_backend.cpp > > index 53dec0a..ee5b6a3 100644 > > --- a/backend/src/llvm/llvm_gen_backend.cpp > > +++ b/backend/src/llvm/llvm_gen_backend.cpp > > @@ -3310,11 +3310,9 @@ error: > > ir::Type srcType = getType(ctx, llvmSrcType); > > GBE_ASSERT(srcType == dstType); > > > > - const ir::Register tmp = ctx.reg(getFamily(ir::TYPE_S32)); > > const ir::Register dst = this->getRegister(&I); > > const ir::Register src = this->getRegister(I.getOperand(0)); > > - ctx.CVT(ir::TYPE_S32, srcType, tmp, src); > > - ctx.CVT(dstType, ir::TYPE_S32, dst, tmp); > > + ctx.RNDD(dstType, dst, src); > > } > > break; > > case Intrinsic::copysign: > > -- > > 1.9.1 > > > > _______________________________________________ > > Beignet mailing list > > [email protected] > > http://lists.freedesktop.org/mailman/listinfo/beignet > _______________________________________________ > Beignet mailing list > [email protected] > http://lists.freedesktop.org/mailman/listinfo/beignet _______________________________________________ Beignet mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/beignet
