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Improve shrink wrapping debug output

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Currently if requires_stack_frame_p() returns true for some insn, the
shrink-wrapping debug output contains only the number of a block containing
that insn.

But it is very useful to see the particular insn that requires the prologue.
Let's call print_rtl_single to display that insn in the following pass dump.

gcc/

	* shrink-wrap.c (try_shrink_wrapping): Improve debug output.
This commit is contained in:
Alexander Popov 2020-07-10 14:10:16 -06:00 • committed by Jeff Law
parent def4c0b47e
commit 5ada27f8e0
1 changed files with 6 additions and 1 deletions
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7
gcc/shrink-wrap.c
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@ -43,6 +43,7 @@ along with GCC; see the file COPYING3. If not see
#include "rtl-iter.h"
#include "valtrack.h"
#include "function-abi.h"
#include "print-rtl.h"
/* Return true if INSN requires the stack frame to be set up.
PROLOGUE_USED contains the hard registers used in the function
@ -735,7 +736,11 @@ try_shrink_wrapping (edge *entry_edge, rtx_insn *prologue_seq)
set_up_by_prologue.set))
{
if (dump_file)
fprintf (dump_file, "Block %d needs the prologue.\n", bb->index);
{
fprintf (dump_file, "Block %d needs prologue due to insn %d:\n",
bb->index, INSN_UID (insn));
print_rtl_single (dump_file, insn);
}
pro = nearest_common_dominator (CDI_DOMINATORS, pro, bb);
break;
}