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Properly store 128-bit constant in large model 

When converting TI store with CONST_INT to V1TI store with CONST_VECTOR
in large model, an extra instruction may be needed to load CONST_VECTOR
into a register.  Insert the extra instruction to the right place.

gcc/

	PR target/79498
	* config/i386/i386.c (timode_scalar_chain::convert_insn): Insert
	the extra instruction to the right place to store 128-bit constant
	when needed.

gcc/testsuite/

	PR target/79498
	* gcc.target/i386/pr79498.c: New test.

From-SVN: r245438
This commit is contained in:
H.J. Lu 2017-02-14 16:53:22 +00:00 committed by H.J. Lu
parent bf00c9e080
commit ee139af532
4 changed files with 37 additions and 0 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2017-02-14 H.J. Lu <hongjiu.lu@intel.com>
PR target/79498
* config/i386/i386.c (timode_scalar_chain::convert_insn): Insert
the extra instruction to the right place to store 128-bit constant
when needed.
2017-02-14 Martin Sebor <msebor@redhat.com>
PR middle-end/79448

5
gcc/config/i386/i386.c
View File

@ -3956,8 +3956,13 @@ timode_scalar_chain::convert_insn (rtx_insn *insn)
/* Since there are no instructions to store 128-bit constant,
temporary register usage is required. */
rtx tmp = gen_reg_rtx (V1TImode);
start_sequence ();
src = gen_rtx_CONST_VECTOR (V1TImode, gen_rtvec (1, src));
src = validize_mem (force_const_mem (V1TImode, src));
rtx_insn *seq = get_insns ();
end_sequence ();
if (seq)
emit_insn_before (seq, insn);
emit_conversion_insns (gen_rtx_SET (dst, tmp), insn);
dst = tmp;
}

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2017-02-14 H.J. Lu <hongjiu.lu@intel.com>
PR target/79498
* gcc.target/i386/pr79498.c: New test.
2017-02-14 Martin Sebor <msebor@redhat.com>
PR middle-end/79448

20
gcc/testsuite/gcc.target/i386/pr79498.c Normal file
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@ -0,0 +1,20 @@
/* PR target/79498 */
/* { dg-do compile { target lp64 } } */
/* { dg-options "-O2 -mno-avx512f -mcmodel=large -Wno-psabi" } */
typedef unsigned U __attribute__ ((vector_size (64)));
typedef unsigned __int128 V __attribute__ ((vector_size (64)));
static inline V
bar (U u, U x, V v)
{
v = (V)(U) { 0, ~0 };
v[x[0]] <<= u[-63];
return v;
}
V
foo (U u)
{
return bar (u, (U) {}, (V) {});
}