From: Andrew Stubbs <ams@codesourcery.com>
Date: Fri, 10 Nov 2023 09:43:21 +0000 (+0000)
Subject: amdgcn: Fix vector min/max ICE
X-Git-Tag: basepoints/gcc-15~4823
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=8da8b9225762126ca41b12243d6531cd41a831b3;p=thirdparty%2Fgcc.git

amdgcn: Fix vector min/max ICE

The DImode min/max instructions need a clobber that SImode does not, so
add the special case to the reduction expand code.

gcc/ChangeLog:

	* config/gcn/gcn.cc (gcn_expand_reduc_scalar): Add clobber to DImode
	min/max instructions.
---

diff --git a/gcc/config/gcn/gcn.cc b/gcc/config/gcn/gcn.cc
index 6a2aaefceca4..ac2992592134 100644
--- a/gcc/config/gcn/gcn.cc
+++ b/gcc/config/gcn/gcn.cc
@@ -5514,7 +5514,15 @@ gcn_expand_reduc_scalar (machine_mode mode, rtx src, int unspec)
 	{
 	  rtx tmp = gen_reg_rtx (mode);
 	  emit_insn (gen_dpp_move (mode, tmp, in, shift_val));
-	  emit_insn (gen_rtx_SET (out, gen_rtx_fmt_ee (code, mode, tmp, in)));
+	  rtx insn = gen_rtx_SET (out, gen_rtx_fmt_ee (code, mode, tmp, in));
+	  if (scalar_mode == DImode)
+	    {
+	      rtx clobber = gen_rtx_CLOBBER (VOIDmode,
+					     gen_rtx_REG (DImode, VCC_REG));
+	      insn = gen_rtx_PARALLEL (VOIDmode,
+				       gen_rtvec (2, insn, clobber));
+	    }
+	  emit_insn (insn);
 	}
       else
 	{