From: Kwok Cheung Yeung <kcy@codesourcery.com>
Date: Fri, 15 Nov 2019 12:54:40 +0000 (+0000)
Subject: [amdgcn] Fix handling of VCC_CONDITIONAL_REG
X-Git-Tag: misc/cutover-git~1195
X-Git-Url: https://gcc.gnu.org/git/?a=commitdiff_plain;h=9ecf84e6a5616e30a03b4813b696607b2aa12d47;p=gcc.git

[amdgcn] Fix handling of VCC_CONDITIONAL_REG

Classify vcc_lo and vcc_hi into the VCC_CONDITIONAL_REG class,
and spill them into SGPRs if necessary.

2019-11-15  Kwok Cheung Yeung  <kcy@codesourcery.com>

	gcc/
	* config/gcn/gcn.c (gcn_regno_reg_class): Return VCC_CONDITIONAL_REG
	register class for VCC_LO and VCC_HI.
	(gcn_spill_class): Use SGPR_REGS to spill registers in
	VCC_CONDITIONAL_REG.

From-SVN: r278290
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5eb21e7e4a8f..d44f5a3fce0d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2019-11-15  Kwok Cheung Yeung  <kcy@codesourcery.com>
+
+	* config/gcn/gcn.c (gcn_regno_reg_class): Return VCC_CONDITIONAL_REG
+	register class for VCC_LO and VCC_HI.
+	(gcn_spill_class): Use SGPR_REGS to spill registers in
+	VCC_CONDITIONAL_REG.
+
 2019-11-15  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/92324
diff --git a/gcc/config/gcn/gcn.c b/gcc/config/gcn/gcn.c
index 20534a2fbe67..f12d06d5e876 100644
--- a/gcc/config/gcn/gcn.c
+++ b/gcc/config/gcn/gcn.c
@@ -462,6 +462,9 @@ gcn_regno_reg_class (int regno)
     {
     case SCC_REG:
       return SCC_CONDITIONAL_REG;
+    case VCC_LO_REG:
+    case VCC_HI_REG:
+      return VCC_CONDITIONAL_REG;
     case VCCZ_REG:
       return VCCZ_CONDITIONAL_REG;
     case EXECZ_REG:
@@ -629,7 +632,8 @@ gcn_can_split_p (machine_mode, rtx op)
 static reg_class_t
 gcn_spill_class (reg_class_t c, machine_mode /*mode */ )
 {
-  if (reg_classes_intersect_p (ALL_CONDITIONAL_REGS, c))
+  if (reg_classes_intersect_p (ALL_CONDITIONAL_REGS, c)
+      || c == VCC_CONDITIONAL_REG)
     return SGPR_REGS;
   else
     return NO_REGS;