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i386: Use TImode for BLKmode values in 2 integer registers

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When passing and returning BLKmode values in 2 integer registers, use
1 TImode register instead of 2 DImode registers. Otherwise, V1TImode
may be used to move and store such BLKmode values, which prevent RTL
optimizations.

gcc/

	PR target/87370
	* config/i386/i386.c (construct_container): Use TImode for
	BLKmode values in 2 integer registers.

gcc/testsuite/

	PR target/87370
	* gcc.target/i386/pr87370.c: New test.

From-SVN: r264716
This commit is contained in:
H.J. Lu 2018-09-29 21:59:59 +00:00 committed by H.J. Lu
parent 29a94bf97d
commit bdfbaa72c5
4 changed files with 65 additions and 2 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2018-09-29 H.J. Lu <hongjiu.lu@intel.com>
PR target/87370
* config/i386/i386.c (construct_container): Use TImode for
BLKmode values in 2 integer registers.
2018-09-29 Jeff Law <law@redhat.com>
* builtins.c (unterminated_array): Pass in c_strlen_data * to

17
gcc/config/i386/i386.c
View File

@ -7914,9 +7914,22 @@ construct_container (machine_mode mode, machine_mode orig_mode,
if (n == 2
&& regclass[0] == X86_64_INTEGER_CLASS
&& regclass[1] == X86_64_INTEGER_CLASS
&& (mode == CDImode || mode == TImode)
&& (mode == CDImode || mode == TImode || mode == BLKmode)
&& intreg[0] + 1 == intreg[1])
return gen_rtx_REG (mode, intreg[0]);
{
if (mode == BLKmode)
{
/* Use TImode for BLKmode values in 2 integer registers. */
exp[0] = gen_rtx_EXPR_LIST (VOIDmode,
gen_rtx_REG (TImode, intreg[0]),
GEN_INT (0));
ret = gen_rtx_PARALLEL (mode, rtvec_alloc (1));
XVECEXP (ret, 0, 0) = exp[0];
return ret;
}
else
return gen_rtx_REG (mode, intreg[0]);
}
/* Otherwise figure out the entries of the PARALLEL. */
for (i = 0; i < n; i++)

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2018-09-29 H.J. Lu <hongjiu.lu@intel.com>
PR target/87370
* gcc.target/i386/pr87370.c: New test.
2018-09-29 Paul Thomas <pault@gcc.gnu.org>
PR fortran/65667

39
gcc/testsuite/gcc.target/i386/pr87370.c Normal file
View File

@ -0,0 +1,39 @@
/* { dg-do compile { target { ! ia32 } } } */
/* { dg-options "-O2" } */
struct A
{
int b[4];
};
struct B
{
char a[12];
int b;
};
struct C
{
char a[16];
};
struct A
f1 (void)
{
struct A x = {};
return x;
}
struct B
f2 (void)
{
struct B x = {};
return x;
}
struct C
f3 (void)
{
struct C x = {};
return x;
}
/* { dg-final { scan-assembler-not "xmm" } } */