From: Ilia Mirkin <imirkin@alum.mit.edu>
Date: Sat, 12 Aug 2017 04:02:34 +0000 (-0400)
Subject: nvc0/ir: unlink values pre- and post-call to division function
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=ea22ac23e04c093f9dd0bb8f9b946e61d79824ff;p=mesa.git

nvc0/ir: unlink values pre- and post-call to division function

While technically correct, this can lead to e.g. getImmediate assuming
that it can walk up the value chain. It could be fixed to not do this,
but it seems easier and less error-prone to just not link the two values
to save on one LValue object.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
---

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
index 64d743708a6..c8f07015728 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
@@ -45,11 +45,10 @@ NVC0LegalizeSSA::handleDIV(Instruction *i)
 {
    FlowInstruction *call;
    int builtin;
-   Value *def[2];
 
    bld.setPosition(i, false);
-   def[0] = bld.mkMovToReg(0, i->getSrc(0))->getDef(0);
-   def[1] = bld.mkMovToReg(1, i->getSrc(1))->getDef(0);
+   bld.mkMovToReg(0, i->getSrc(0));
+   bld.mkMovToReg(1, i->getSrc(1));
    switch (i->dType) {
    case TYPE_U32: builtin = NVC0_BUILTIN_DIV_U32; break;
    case TYPE_S32: builtin = NVC0_BUILTIN_DIV_S32; break;
@@ -57,7 +56,7 @@ NVC0LegalizeSSA::handleDIV(Instruction *i)
       return;
    }
    call = bld.mkFlow(OP_CALL, NULL, CC_ALWAYS, NULL);
-   bld.mkMov(i->getDef(0), def[(i->op == OP_DIV) ? 0 : 1]);
+   bld.mkMovFromReg(i->getDef(0), i->op == OP_DIV ? 0 : 1);
    bld.mkClobber(FILE_GPR, (i->op == OP_DIV) ? 0xe : 0xd, 2);
    bld.mkClobber(FILE_PREDICATE, (i->dType == TYPE_S32) ? 0xf : 0x3, 0);