Author: dim
Date: Sun Mar 13 18:34:32 2016
New Revision: 296802
URL: https://svnweb.freebsd.org/changeset/base/296802
Log:
Add patch corresponding to r296800.
Added:
stable/10/contrib/llvm/patches/patch-r296800-llvm-r219512-out-of-registers.diff
Added:
stable/10/contrib/llvm/patches/patch-r296800-llvm-r219512-out-of-registers.diff
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++
stable/10/contrib/llvm/patches/patch-r296800-llvm-r219512-out-of-registers.diff
Sun Mar 13 18:34:32 2016 (r296802)
@@ -0,0 +1,33 @@
+Pull in r219512 from upstream llvm trunk (by Hal Finkel):
+
+ [MiSched] Fix a logic error in tryPressure()
+
+ Fixes a logic error in the MachineScheduler found by Steve Montgomery
+ (and confirmed by Andy). This has gone unfixed for months because the
+ fix has been found to introduce some small performance regressions.
+ However, Andy has recommended that, at this point, we fix this to
+ avoid further dependence on the incorrect behavior (and then
+ follow-up separately on any regressions), and I agree.
+
+ Fixes PR18883.
+
+This fixes a possible "ran out of registers" error when compiling
+www/firefox 45.0 on i386.
+
+Introduced here: http://svnweb.freebsd.org/changeset/base/xxxxxx
+
+Index: lib/CodeGen/MachineScheduler.cpp
+===================================================================
+--- lib/CodeGen/MachineScheduler.cpp
++++ lib/CodeGen/MachineScheduler.cpp
+@@ -2365,8 +2365,8 @@ static bool tryPressure(const PressureChange &TryP
+ }
+ // If one candidate decreases and the other increases, go with it.
+ // Invalid candidates have UnitInc==0.
+- if (tryLess(TryP.getUnitInc() < 0, CandP.getUnitInc() < 0, TryCand, Cand,
+- Reason)) {
++ if (tryGreater(TryP.getUnitInc() < 0, CandP.getUnitInc() < 0, TryCand, Cand,
++ Reason)) {
+ return true;
+ }
+ // If the candidates are decreasing pressure, reverse priority.
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