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df-scan: remove ad-hoc handling of global regs in asms

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PR rtl-optimization/79985
	* df-scan.c (df_insn_refs_collect): Remove special case for
	global registers and asm statements.

testsuite/
	* gcc.dg/pr79985.c: New testcase.

From-SVN: r260613
This commit is contained in:
Alexander Monakov 2018-05-23 18:01:28 +03:00 • committed by Alexander Monakov
parent 8851a51161
commit 3f13154553
4 changed files with 22 additions and 11 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2018-05-23 Alexander Monakov <amonakov@ispras.ru>
PR rtl-optimization/79985
* df-scan.c (df_insn_refs_collect): Remove special case for
global registers and asm statements.
2018-05-23 Alexander Monakov <amonakov@ispras.ru>
* extend.texi (Global Register Variables): Rewrite the bullet list.

11
gcc/df-scan.c
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@ -3207,17 +3207,6 @@ df_insn_refs_collect (struct df_collection_rec *collection_rec,
if (CALL_P (insn_info->insn))
df_get_call_refs (collection_rec, bb, insn_info, flags);
if (asm_noperands (PATTERN (insn_info->insn)) >= 0)
for (unsigned i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (global_regs[i])
{
/* As with calls, asm statements reference all global regs. */
df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i],
NULL, bb, insn_info, DF_REF_REG_USE, flags);
df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i],
NULL, bb, insn_info, DF_REF_REG_DEF, flags);
}
/* Record other defs. These should be mostly for DF_REF_REGULAR, so
that a qsort on the defs is unnecessary in most cases. */
df_defs_record (collection_rec,

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2018-05-23 Alexander Monakov <amonakov@ispras.ru>
* gcc.dg/pr79985.c: New testcase.
2018-05-23 Richard Biener <rguenther@suse.de>
* gcc.dg/tree-ssa/ssa-fre-66.c: New testcase.

12
gcc/testsuite/gcc.dg/pr79985.c Normal file
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@ -0,0 +1,12 @@
/* PR rtl-optimization/79985 */
/* { dg-do compile { target powerpc*-*-* ia64-*-* i?86-*-* x86_64-*-* } } */
/* { dg-options "-O3 -fschedule-insns -fselective-scheduling" } */
long a;
int b;
void
c ()
{
__asm("" : "=r"(a) : "0"(c));
__asm("" : "=r"(b));
}