diff mbox series

rs6000: Change optab for ibm128 and ieee128 conversion

Message ID 2fcb1f59-94ac-95d5-fe6f-13e873b5edca@linux.ibm.com
State New
Headers show
Series rs6000: Change optab for ibm128 and ieee128 conversion | expand

Commit Message

Kewen.Lin July 12, 2024, 7:05 a.m. UTC 
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(-)

--
2.43.5
diff mbox series

Patch

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;