The following patch has been committed into the main line. The patch fixes
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97313
The patch was successfully bootstrapped and tested on x86-64.
gcc/ChangeLog:
2020-10-09 Vladimir Makarov <vmaka...@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 <vmaka...@redhat.com>
PR rtl-optimization/97313
* gcc.target/i386/pr97313.c: New.
diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c
index 301c912cb21..f761d7dfe3c 100644
--- a/gcc/lra-constraints.c
+++ b/gcc/lra-constraints.c
@@ -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);
diff --git a/gcc/testsuite/gcc.target/i386/pr97313.c b/gcc/testsuite/gcc.target/i386/pr97313.c
new file mode 100644
index 00000000000..ef93cf1cca8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr97313.c
@@ -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;
+}
