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Don't keep strict_low_part in reloads for non-registers. [PR97313] 

gcc/ChangeLog:

2020-10-09  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/97313
	* lra-constraints.c (match_reload): Don't keep strict_low_part in
	reloads for non-registers.

gcc/testsuite/ChangeLog:

2020-10-09  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/97313
	* gcc.target/i386/pr97313.c: New.
This commit is contained in:
Vladimir N. Makarov 2020-10-09 10:01:13 -04:00
parent 98c37d3bac
commit bb37ad8cc0
2 changed files with 30 additions and 1 deletions
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7
gcc/lra-constraints.c
View File

@ -1132,8 +1132,13 @@ match_reload (signed char out, signed char *ins, signed char *outs,
narrow_reload_pseudo_class (out_rtx, goal_class);
if (find_reg_note (curr_insn, REG_UNUSED, out_rtx) == NULL_RTX)
{
reg = SUBREG_P (out_rtx) ? SUBREG_REG (out_rtx) : out_rtx;
start_sequence ();
if (out >= 0 && curr_static_id->operand[out].strict_low)
/* If we had strict_low_part, use it also in reload to keep other
parts unchanged but do it only for regs as strict_low_part
has no sense for memory and probably there is no insn pattern
to match the reload insn in memory case. */
if (out >= 0 && curr_static_id->operand[out].strict_low && REG_P (reg))
out_rtx = gen_rtx_STRICT_LOW_PART (VOIDmode, out_rtx);
lra_emit_move (out_rtx, copy_rtx (new_out_reg));
emit_insn (*after);

24
gcc/testsuite/gcc.target/i386/pr97313.c Normal file
View File

@ -0,0 +1,24 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fPIE" } */
typedef struct {
int unspecified : 1;
int secure : 1;
} MemTxAttrs;
enum { MSCAllowNonSecure } tz_msc_read_pdata;
int tz_msc_read_s_0;
int tz_msc_check();
int address_space_ldl_le();
void tz_msc_read(MemTxAttrs attrs) {
int as = tz_msc_read_s_0;
long long data;
switch (tz_msc_check()) {
case MSCAllowNonSecure:
attrs.secure = attrs.unspecified = 0;
data = address_space_ldl_le(as, attrs);
}
tz_msc_read_pdata = data;
}