From: Richard Sandiford <richard.sandiford@arm.com>
Date: Wed, 9 Jul 2025 15:39:20 +0000 (+0100)
Subject: Make the RTL frontend set REG_NREGS correctly
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=76db38d811a63a603deedfe327d5e201fc820444;p=thirdparty%2Fgcc.git

Make the RTL frontend set REG_NREGS correctly

While working on a new testcase that uses the RTL frontend,
I hit a bug where a (reg ...) that spans multiple hard registers
had REG_NREGS set to 1.  This caused various things to misbehave.
For example, if the (reg ...) in question was used as crtl->return_rtx,
only the first register in the group would be marked as live on exit.

gcc/
	* read-rtl-function.cc (function_reader::read_rtx_operand_r): Use
	hard_regno_nregs to work out REG_NREGS for hard registers.
---

diff --git a/gcc/read-rtl-function.cc b/gcc/read-rtl-function.cc
index fb9c9554ea3..1f08c50cc12 100644
--- a/gcc/read-rtl-function.cc
+++ b/gcc/read-rtl-function.cc
@@ -1065,7 +1065,10 @@ function_reader::read_rtx_operand_r (rtx x)
   if (regno == -1)
     fatal_at (loc, "unrecognized register: '%s'", name.string);
 
-  set_regno_raw (x, regno, 1);
+  int nregs = 1;
+  if (HARD_REGISTER_NUM_P (regno))
+    nregs = hard_regno_nregs (regno, GET_MODE (x));
+  set_regno_raw (x, regno, nregs);
 
   /* Consolidate singletons.  */
   x = consolidate_singletons (x);