From: Andrew Stubbs <ams@codesourcery.com>
Date: Mon, 9 Nov 2020 17:42:34 +0000 (+0000)
Subject: amdgcn: Allow V64DFmode min/max reductions
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f8fd4ad642bfc1be25bdfead85ae06e0a75fcea1;p=thirdparty%2Fgcc.git

amdgcn: Allow V64DFmode min/max reductions

I don't know why these were disabled. There're no direct min/max DPP
instructions for this mode, but the "use moves" strategy works fine.

gcc/ChangeLog:

	* config/gcn/gcn.c (gcn_expand_reduc_scalar): Use move instructions
	for V64DFmode min/max reductions.

Backport from d9f50366102a8ca3521e4854f7716bd013c8ea0a.
---

diff --git a/gcc/config/gcn/gcn.c b/gcc/config/gcn/gcn.c
index f0e4636c06a9..095de6a2f7ec 100644
--- a/gcc/config/gcn/gcn.c
+++ b/gcc/config/gcn/gcn.c
@@ -4363,7 +4363,8 @@ gcn_expand_reduc_scalar (machine_mode mode, rtx src, int unspec)
 		      || unspec == UNSPEC_SMAX_DPP_SHR
 		      || unspec == UNSPEC_UMIN_DPP_SHR
 		      || unspec == UNSPEC_UMAX_DPP_SHR)
-		     && mode == V64DImode)
+		     && (mode == V64DImode
+			 || mode == V64DFmode))
 		    || (unspec == UNSPEC_PLUS_DPP_SHR
 			&& mode == V64DFmode));
   rtx_code code = (unspec == UNSPEC_SMIN_DPP_SHR ? SMIN