@@ -10308,6 +10308,59 @@ can_be_built_by_li_lis_and_rotldi (HOST_WIDE_INT c, int *shift,
return false;
}
+/* Check if value C can be built by 2 instructions: one is 'li or lis',
+ another is rldicl.
+
+ If so, *SHIFT is set to the shift operand of rldicl, and *MASK is set to
+ the mask operand of rldicl, and return true.
+ Return false otherwise. */
+static bool
+can_be_built_by_li_lis_and_rldicl (HOST_WIDE_INT c, int *shift,
+ HOST_WIDE_INT *mask)
+{
+ /* Leading zeros maybe cleaned by rldicl with mask. Change leading zeros
+ to ones and then recheck it. */
+ int lz = clz_hwi (c);
+ HOST_WIDE_INT unmask_c
+ = c | (HOST_WIDE_INT_M1U << (HOST_BITS_PER_WIDE_INT - lz));
+ int n;
+ if (can_be_rotated_to_negative_li (unmask_c, &n)
+ || can_be_rotated_to_negative_lis (unmask_c, &n))
+ {
+ *mask = HOST_WIDE_INT_M1U >> lz;
+ *shift = n == 0 ? 0 : HOST_BITS_PER_WIDE_INT - n;
+ return true;
+ }
+
+ return false;
+}
+
+/* Check if value C can be built by 2 instructions: one is 'li or lis',
+ another is rldicr.
+
+ If so, *SHIFT is set to the shift operand of rldicr, and *MASK is set to
+ the mask operand of rldicr, and return true.
+ Return false otherwise. */
+static bool
+can_be_built_by_li_lis_and_rldicr (HOST_WIDE_INT c, int *shift,
+ HOST_WIDE_INT *mask)
+{
+ /* Tailing zeros maybe cleaned by rldicr with mask. Change tailing zeros
+ to ones and then recheck it. */
+ int tz = ctz_hwi (c);
+ HOST_WIDE_INT unmask_c = c | ((HOST_WIDE_INT_1U << tz) - 1);
+ int n;
+ if (can_be_rotated_to_negative_li (unmask_c, &n)
+ || can_be_rotated_to_negative_lis (unmask_c, &n))
+ {
+ *mask = HOST_WIDE_INT_M1U << tz;
+ *shift = HOST_BITS_PER_WIDE_INT - n;
+ return true;
+ }
+
+ return false;
+}
+
/* Subroutine of rs6000_emit_set_const, handling PowerPC64 DImode.
Output insns to set DEST equal to the constant C as a series of
lis, ori and shl instructions. */
@@ -10347,7 +10400,9 @@ rs6000_emit_set_long_const (rtx dest, HOST_WIDE_INT c)
emit_move_insn (dest, gen_rtx_XOR (DImode, temp,
GEN_INT ((ud2 ^ 0xffff) << 16)));
}
- else if (can_be_built_by_li_lis_and_rotldi (c, &shift, &mask))
+ else if (can_be_built_by_li_lis_and_rotldi (c, &shift, &mask)
+ || can_be_built_by_li_lis_and_rldicl (c, &shift, &mask)
+ || can_be_built_by_li_lis_and_rldicr (c, &shift, &mask))
{
temp = !can_create_pseudo_p () ? dest : gen_reg_rtx (DImode);
unsigned HOST_WIDE_INT imm = (c | ~mask);
@@ -46,6 +46,42 @@ lis_rotldi_6 (void)
return 0x5310000ffffffff8LL;
}
+long long NOIPA
+li_rldicl_7 (void)
+{
+ return 0x3ffffffa1LL;
+}
+
+long long NOIPA
+li_rldicl_8 (void)
+{
+ return 0xff8531ffffffffLL;
+}
+
+long long NOIPA
+lis_rldicl_9 (void)
+{
+ return 0x00ff85310000ffffLL;
+}
+
+long long NOIPA
+li_rldicr_10 (void)
+{
+ return 0xffff8531fff00000LL;
+}
+
+long long NOIPA
+li_rldicr_11 (void)
+{
+ return 0x21fffffffff00000LL;
+}
+
+long long NOIPA
+lis_rldicr_12 (void)
+{
+ return 0x5310000ffffffff0LL;
+}
+
struct fun arr[] = {
{li_rotldi_1, 0x7531000000000LL},
{li_rotldi_2, 0x2100000000000064LL},
@@ -53,9 +89,17 @@ struct fun arr[] = {
{li_rotldi_4, 0x21ffffffffffff94LL},
{lis_rotldi_5, 0xffff85310000ffffLL},
{lis_rotldi_6, 0x5310000ffffffff8LL},
+ {li_rldicl_7, 0x3ffffffa1LL},
+ {li_rldicl_8, 0xff8531ffffffffLL},
+ {lis_rldicl_9, 0x00ff85310000ffffLL},
+ {li_rldicr_10, 0xffff8531fff00000LL},
+ {li_rldicr_11, 0x21fffffffff00000LL},
+ {lis_rldicr_12, 0x5310000ffffffff0LL},
};
/* { dg-final { scan-assembler-times {\mrotldi\M} 6 } } */
+/* { dg-final { scan-assembler-times {\mrldicl\M} 3 } } */
+/* { dg-final { scan-assembler-times {\mrldicr\M} 3 } } */
int
main ()
Hi, This patch checks if a constant is possible left/right cleaned on a rotated value from a negative value of "li/lis". If so, we can build the constant through "li/lis ; rldicl/rldicr". Bootstrap and regtest pass on ppc64{,le}. Is this ok for trunk or next stage1? BR, Jeff (Jiufu) gcc/ChangeLog: * config/rs6000/rs6000.cc (can_be_built_by_li_lis_and_rldicl): New function. (can_be_built_by_li_lis_and_rldicr): New function. (rs6000_emit_set_long_const): Call can_be_built_by_li_lis_and_rldicr and can_be_built_by_li_lis_and_rldicl. gcc/testsuite/ChangeLog: * gcc.target/powerpc/const-build.c: Add more tests. --- gcc/config/rs6000/rs6000.cc | 57 ++++++++++++++++++- .../gcc.target/powerpc/const-build.c | 44 ++++++++++++++ 2 files changed, 100 insertions(+), 1 deletion(-)