Hi,
Currently for 128 bit floating-point ibm128 and ieee128
formats conversion, the corresponding libcalls are:
ibm128 -> ieee128 "__trunctfkf2"
ieee128 -> ibm128 "__extendkftf2"
, and generic code handling (like convert_mode_scalar) also
adopts sext_optab for ieee128 -> ibm128 while trunc_optab
for ibm128 -> ieee128. But in rs6000 port as function
rs6000_expand_float128_convert and init_float128_ieee show,
we adopt sext_optab for ibm128 -> ieee128 with "__trunctfkf2"
while trunc_optab for ieee128 -> ibm128 with "__extendkftf2".
To make them consistent and avoid some surprises, this patch
is to adjust rs6000 internal handlings by adopting trunc_optab
for ibm128 -> ieee128 with "__trunctfkf2" while sext_optab for
ieee128 -> ibm128 with "__extendkftf2".
Bootstrapped and regtested on powerpc64{,le}-linux-gnu
(ibm128 long double default) and powerpc64le-linux-gnu
(ieee128 long double default).
I'm going to install this next week if no objections.
BR,
Kewen
-----
gcc/ChangeLog:
* config/rs6000/rs6000.cc (init_float128_ieee): Use trunc_optab rather
than sext_optab for converting FLOAT128_IBM_P mode to FLOAT128_IEEE_P
mode, and use sext_optab rather than trunc_optab for converting
FLOAT128_IEEE_P mode to FLOAT128_IBM_P mode.
(rs6000_expand_float128_convert): Likewise.
---
gcc/config/rs6000/rs6000.cc | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index 4af1eeb3722..7e30ab5b207 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -11460,13 +11460,13 @@ init_float128_ieee (machine_mode mode)
set_conv_libfunc (trunc_optab, SFmode, mode, "__trunckfsf2");
set_conv_libfunc (trunc_optab, DFmode, mode, "__trunckfdf2");
- set_conv_libfunc (sext_optab, mode, IFmode, "__trunctfkf2");
+ set_conv_libfunc (trunc_optab, mode, IFmode, "__trunctfkf2");
if (mode != TFmode && FLOAT128_IBM_P (TFmode))
- set_conv_libfunc (sext_optab, mode, TFmode, "__trunctfkf2");
+ set_conv_libfunc (trunc_optab, mode, TFmode, "__trunctfkf2");
- set_conv_libfunc (trunc_optab, IFmode, mode, "__extendkftf2");
+ set_conv_libfunc (sext_optab, IFmode, mode, "__extendkftf2");
if (mode != TFmode && FLOAT128_IBM_P (TFmode))
- set_conv_libfunc (trunc_optab, TFmode, mode, "__extendkftf2");
+ set_conv_libfunc (sext_optab, TFmode, mode, "__extendkftf2");
set_conv_libfunc (sext_optab, mode, SDmode, "__dpd_extendsdkf");
set_conv_libfunc (sext_optab, mode, DDmode, "__dpd_extendddkf");
@@ -15624,7 +15624,7 @@ rs6000_expand_float128_convert (rtx dest, rtx src, bool
unsigned_p)
case E_IFmode:
case E_TFmode:
if (FLOAT128_IBM_P (src_mode))
- cvt = sext_optab;
+ cvt = trunc_optab;
else
do_move = true;
break;
@@ -15686,7 +15686,7 @@ rs6000_expand_float128_convert (rtx dest, rtx src, bool
unsigned_p)
case E_IFmode:
case E_TFmode:
if (FLOAT128_IBM_P (dest_mode))
- cvt = trunc_optab;
+ cvt = sext_optab;
else
do_move = true;
break;
--
2.43.5
