[PATCH V2 2/3] Using pli to split 34bits constant

[Jiufu Guo]

Hi,

For constants with 16bit values, 'li or lis' can be used to generate
the value.  For 34bit constant, 'pli' is ok to generate the value.
For example: 0x6666666666666666ULL, "pli 3,1717986918; rldimi 3,3,32,0"
can be used.

Compare with previous:
https://gcc.gnu.org/pipermail/gcc-patches/2023-October/634196.html
This verion updates a testcase to cover this functionality.

Bootstrap&regtest pass on ppc64{,le}.
Is this ok for trunk?

BR,
Jeff (Jiufu Guo)

gcc/ChangeLog:

        * config/rs6000/rs6000.cc (rs6000_emit_set_long_const): Add code to use
        pli for 34bit constant.

gcc/testsuite/ChangeLog:

        * gcc.target/powerpc/pr93012.c: Update to check pli.

---
 gcc/config/rs6000/rs6000.cc                | 9 +++++++++
 gcc/testsuite/gcc.target/powerpc/pr93012.c | 1 +
 2 files changed, 10 insertions(+)

diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index ba40dd6eee4..b277c52687b 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -10504,6 +10504,15 @@ rs6000_emit_set_long_const (rtx dest, HOST_WIDE_INT c, 
int *num_insns)
       return;                                                                  
\
     }
 
+  if (TARGET_PREFIXED && SIGNED_INTEGER_34BIT_P (c))
+    {
+      /* li/lis/pli */
+      ADJUST_INSN_NUM_AND_RET (1);
+
+      emit_move_insn (dest, GEN_INT (c));
+      return;
+    }
+
   if ((ud4 == 0xffff && ud3 == 0xffff && ud2 == 0xffff && (ud1 & 0x8000))
       || (ud4 == 0 && ud3 == 0 && ud2 == 0 && !(ud1 & 0x8000)))
     {
diff --git a/gcc/testsuite/gcc.target/powerpc/pr93012.c 
b/gcc/testsuite/gcc.target/powerpc/pr93012.c
index 4f764d0576f..a07ff764bbf 100644
--- a/gcc/testsuite/gcc.target/powerpc/pr93012.c
+++ b/gcc/testsuite/gcc.target/powerpc/pr93012.c
@@ -10,4 +10,5 @@ unsigned long long mskh1() { return 0xffff9234ffff9234ULL; }
 unsigned long long mskl1() { return 0x2bcdffff2bcdffffULL; }
 unsigned long long mskse() { return 0xffff1234ffff1234ULL; }
 
+/* { dg-final { scan-assembler-times {\mpli\M} 4 { target has_arch_pwr10 }} } 
*/
 /* { dg-final { scan-assembler-times {\mrldimi\M} 7 } } */
-- 
2.25.1