Dear Harald,

On 9/14/20 10:01 PM, Harald Anlauf wrote:
OK for master?

I think we should fix this properly by using target
hooks as suggested by Joseph in the PR. Otherwise,
I have no idea how one could handle this properly
on the FE side for PowerPC (see below).

Tobias

PS: from gcc/config/rs6000/rs6000-modes.*:

/* IBM 128-bit floating point.  */
FRACTIONAL_FLOAT_MODE (IF, FLOAT_PRECISION_IFmode, 16, ibm_extended_format);

/* Explicit IEEE 128-bit floating point.  */
FRACTIONAL_FLOAT_MODE (KF, FLOAT_PRECISION_KFmode, 16, ieee_quad_format);

/* 128-bit floating point, either IBM 128-bit or IEEE 128-bit.  This is
   adjusted in rs6000_option_override_internal to be the appropriate floating
   point type.  */
FRACTIONAL_FLOAT_MODE (TF, FLOAT_PRECISION_TFmode, 16, ieee_quad_format);

/* We order the 3 128-bit floating point types so that IFmode (IBM 128-bit
   floating point) is the 128-bit floating point type with the highest
   precision (128 bits).  This so that machine independent parts of the
   compiler do not try to widen IFmode to TFmode on ISA 3.0 (power9) that has
   hardware support for IEEE 128-bit.  We set TFmode (long double mode) in
   between, and KFmode (explicit __float128) below it.

   We won't encounter conversion from IEEE 128-bit to IBM 128-bit because we
   don't have insns to support the IBM 128-bit aritmetic operations.  */

#ifndef RS6000_MODES_H
#define RS6000_MODES_H          1
#define FLOAT_PRECISION_IFmode  128
#define FLOAT_PRECISION_TFmode  127
#define FLOAT_PRECISION_KFmode  126

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