Hi,
PR106708 constaint some constants which can be support by li/lis + oris/xoris.
For constant C:
if ((c & 0xFFFFFFFF80008000ULL) == 0x80000000ULL) or say:
32(0)+1(1)+15(x)+1(0)+15(x), we could use li+oris to build constant 'C'.
if ((c & 0xFFFFFFFF00008000ULL) == 0xFFFFFFFF00008000ULL) or say:
32(1)+16(x)+1(1)+15(x), using li+xoris would be ok.
if ((c & 0xFFFFFFFF0000FFFFULL) == 0xFFFFFFFF00000000) or say:
32(1)+1(0)+15(x)+16(0), using lis+xoris would be ok.
This patch update rs6000_emit_set_long_const to support these forms.
Bootstrap and regtest pass on ppc64 and ppc64le.
Is this ok for trunk?
BR,
Jeff(Jiufu)
PR target/106708
gcc/ChangeLog:
* config/rs6000/rs6000.cc (rs6000_emit_set_long_const): Using li/lis +
oris/xoris to build constants.
gcc/testsuite/ChangeLog:
* gcc.target/powerpc/pr106708.c: New test.
* gcc.target/powerpc/pr106708.h: New file.
* gcc.target/powerpc/pr106708_1.c: New test.
---
gcc/config/rs6000/rs6000.cc | 22 +++++++++++++++++++
gcc/testsuite/gcc.target/powerpc/pr106708.c | 10 +++++++++
gcc/testsuite/gcc.target/powerpc/pr106708.h | 9 ++++++++
gcc/testsuite/gcc.target/powerpc/pr106708_1.c | 17 ++++++++++++++
4 files changed, 58 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/powerpc/pr106708.c
create mode 100644 gcc/testsuite/gcc.target/powerpc/pr106708.h
create mode 100644 gcc/testsuite/gcc.target/powerpc/pr106708_1.c
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index df491bee2ea..243247fb838 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -10112,6 +10112,7 @@ rs6000_emit_set_long_const (rtx dest, HOST_WIDE_INT c)
{
rtx temp;
HOST_WIDE_INT ud1, ud2, ud3, ud4;
+ HOST_WIDE_INT orig_c = c;
ud1 = c & 0xffff;
c = c >> 16;
@@ -10137,6 +10138,27 @@ rs6000_emit_set_long_const (rtx dest, HOST_WIDE_INT c)
gen_rtx_IOR (DImode, copy_rtx (temp),
GEN_INT (ud1)));
}
+ else if (ud4 == 0 && ud3 == 0 && (ud2 & 0x8000) && !(ud1 & 0x8000))
+ {
+ temp = !can_create_pseudo_p () ? dest : gen_reg_rtx (DImode);
+
+ /* li+oris */
+ emit_move_insn (copy_rtx (temp), GEN_INT (ud1));
+ emit_move_insn (dest, gen_rtx_IOR (DImode, copy_rtx (temp),
+ GEN_INT (ud2 << 16)));
+ }
+ else if ((ud4 == 0xffff && ud3 == 0xffff)
+ && ((ud1 & 0x8000) || (ud1 == 0 && !(ud2 & 0x8000))))
+ {
+ temp = !can_create_pseudo_p () ? dest : gen_reg_rtx (DImode);
+
+ HOST_WIDE_INT imm = (ud1 & 0x8000) ? ((ud1 ^ 0x8000) - 0x8000)
+ : ((ud2 << 16) - 0x80000000);
+ /* li/lis + xoris */
+ emit_move_insn (copy_rtx (temp), GEN_INT (imm));
+ emit_move_insn (dest, gen_rtx_XOR (DImode, copy_rtx (temp),
+ GEN_INT (orig_c ^ imm)));
+ }
else if (ud3 == 0 && ud4 == 0)
{
temp = !can_create_pseudo_p () ? dest : gen_reg_rtx (DImode);
diff --git a/gcc/testsuite/gcc.target/powerpc/pr106708.c
b/gcc/testsuite/gcc.target/powerpc/pr106708.c
new file mode 100644
index 00000000000..6445fa47747
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr106708.c
@@ -0,0 +1,10 @@
+/* PR target/106708 */
+/* { dg-options "-O2 -mdejagnu-cpu=power8" } */
+/* { dg-do compile { target has_arch_ppc64 } } */
+
+#include "pr106708.h"
+
+/* { dg-final { scan-assembler-times {\mli\M} 2 } } */
+/* { dg-final { scan-assembler-times {\mlis\M} 1 } } */
+/* { dg-final { scan-assembler-times {\moris\M} 1 } } */
+/* { dg-final { scan-assembler-times {\mxoris\M} 2 } } */
diff --git a/gcc/testsuite/gcc.target/powerpc/pr106708.h
b/gcc/testsuite/gcc.target/powerpc/pr106708.h
new file mode 100644
index 00000000000..ad07eb30547
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr106708.h
@@ -0,0 +1,9 @@
+/* li/lis + oris/xoris */
+void __attribute__ ((__noinline__, __noclone__)) foo (long long *arg)
+{
+ *arg++ = 0x98765432ULL;
+ *arg++ = 0xffffffff7cdeab55ULL;
+ *arg++ = 0xffffffff65430000ULL;
+}
+
+
diff --git a/gcc/testsuite/gcc.target/powerpc/pr106708_1.c
b/gcc/testsuite/gcc.target/powerpc/pr106708_1.c
new file mode 100644
index 00000000000..df65c321f6b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr106708_1.c
@@ -0,0 +1,17 @@
+/* PR target/106708 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+#include "pr106708.h"
+
+long long arr[] = {0x98765432ULL, 0xffffffff7cdeab55ULL,
0xffffffff65430000ULL};
+int
+main ()
+{
+ long long a[3];
+
+ foo (a);
+ if (__builtin_memcmp (a, arr, sizeof (arr)) != 0)
+ __builtin_abort ();
+ return 0;
+}
--
2.17.1
