From: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
Date: Fri, 15 May 2026 08:12:15 +0000 (-0700)
Subject: ssa_operands: speed up GIMPLE_SWITCH handling
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8c8f688fd8d936859dda5cd2eea88f0b22b6c189;p=thirdparty%2Fgcc.git

ssa_operands: speed up GIMPLE_SWITCH handling

The operands of a GIMPLE_SWITCH is index, followed by the cases.
The cases are all CASE_LABEL_EXPR which are skipped via operands_scanner::get_expr_operands
anyways so we only need to scan the index operand.
This also the first step in changing GIMPLE_SWITCH slightly.

gcc/ChangeLog:

	* tree-ssa-operands.cc (operands_scanner::parse_ssa_operands):
	Process index of the gswitch only.

Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
---

diff --git a/gcc/tree-ssa-operands.cc b/gcc/tree-ssa-operands.cc
index f9e347e8dbc..4c5c4ee8db9 100644
--- a/gcc/tree-ssa-operands.cc
+++ b/gcc/tree-ssa-operands.cc
@@ -976,6 +976,12 @@ operands_scanner::parse_ssa_operands ()
       append_vuse (gimple_vop (fn));
       goto do_default;
 
+    /* Switch index is the only operand that matters.  */
+    case GIMPLE_SWITCH:
+      get_expr_operands (gimple_switch_index_ptr (as_a <gswitch*> (stmt)),
+			 opf_use);
+      break;
+
     case GIMPLE_CALL:
       /* Add call-clobbered operands, if needed.  */
       maybe_add_call_vops (as_a <gcall *> (stmt));