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File 0001-Bug-400490-s390x-Fix-register-allocation-for-VRs-vs-.patch of Package valgrind (Revision 174546b8d54fc3eb67878288d200af30)

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From 71002d8a5111d02ce8049c55017a8d948c820e35 Mon Sep 17 00:00:00 2001
From: Andreas Arnez <arnez@linux.ibm.com>
Date: Thu, 25 Oct 2018 13:47:12 +0200
Subject: [PATCH] Bug 400490 s390x: Fix register allocation for VRs vs FPRs

On s390x, if vector registers are available, they are fed to the register
allocator as if they were separate from the floating-point registers.  But
in fact the FPRs are embedded in the VRs.  So for instance, if both f3 and
v3 are allocated and used at the same time, corruption will result.

This is fixed by offering only the non-overlapping VRs, v16 to v31, to the
register allocator instead.
---
 NEWS                      |  1 +
 VEX/priv/host_s390_defs.c | 17 +++++++----------
 2 files changed, 8 insertions(+), 10 deletions(-)

Index: valgrind-3.14.0/VEX/priv/host_s390_defs.c
===================================================================
--- valgrind-3.14.0.orig/VEX/priv/host_s390_defs.c
+++ valgrind-3.14.0/VEX/priv/host_s390_defs.c
@@ -59,7 +59,6 @@ static UInt s390_tchain_load64_len(void)
 
 /* A mapping from register number to register index */
 static Int gpr_index[16];  // GPR regno -> register index
-static Int fpr_index[16];  // FPR regno -> register index
 static Int vr_index[32];   // VR regno -> register index
 
 HReg
@@ -73,7 +72,7 @@ s390_hreg_gpr(UInt regno)
 HReg
 s390_hreg_fpr(UInt regno)
 {
-   Int ix = fpr_index[regno];
+   Int ix = vr_index[regno];
    vassert(ix >= 0);
    return mkHReg(/*virtual*/False, HRcFlt64, regno, ix);
 }
@@ -463,11 +462,9 @@ getRRegUniverse_S390(void)
 
    RRegUniverse__init(ru);
 
-   /* Assign invalid values to the gpr/fpr/vr_index */
+   /* Assign invalid values to the gpr/vr_index */
    for (UInt i = 0; i < sizeof gpr_index / sizeof gpr_index[0]; ++i)
       gpr_index[i] = -1;
-   for (UInt i = 0; i < sizeof fpr_index / sizeof fpr_index[0]; ++i)
-      fpr_index[i] = -1;
    for (UInt i = 0; i < sizeof vr_index / sizeof vr_index[0]; ++i)
       vr_index[i] = -1;
 
@@ -494,17 +491,17 @@ getRRegUniverse_S390(void)
 
    ru->allocable_start[HRcFlt64] = ru->size;
    for (UInt regno = 8; regno <= 15; ++regno) {
-      fpr_index[regno] = ru->size;
+      vr_index[regno] = ru->size;
       ru->regs[ru->size++] = s390_hreg_fpr(regno);
    }
    for (UInt regno = 0; regno <= 7; ++regno) {
-      fpr_index[regno] = ru->size;
+      vr_index[regno] = ru->size;
       ru->regs[ru->size++] = s390_hreg_fpr(regno);
    }
    ru->allocable_end[HRcFlt64] = ru->size - 1;
 
    ru->allocable_start[HRcVec128] = ru->size;
-   for (UInt regno = 0; regno <= 31; ++regno) {
+   for (UInt regno = 16; regno <= 31; ++regno) {
       vr_index[regno] = ru->size;
       ru->regs[ru->size++] = s390_hreg_vr(regno);
    }
@@ -527,12 +524,12 @@ getRRegUniverse_S390(void)
    /* Sanity checking */
    for (UInt i = 0; i < sizeof gpr_index / sizeof gpr_index[0]; ++i)
       vassert(gpr_index[i] >= 0);
-   for (UInt i = 0; i < sizeof fpr_index / sizeof fpr_index[0]; ++i)
-      vassert(fpr_index[i] >= 0);
    for (UInt i = 0; i < sizeof vr_index / sizeof vr_index[0]; ++i)
       vassert(vr_index[i] >= 0);
                  
    initialised = True;
+
+   RRegUniverse__check_is_sane(ru);
    return ru;
 }

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