[PATCH] D21143: Include SelectionDAGISel in the opt-bisect process
Andy Kaylor via llvm-commits
llvm-commits at lists.llvm.org
Wed Jul 6 17:47:21 PDT 2016
andrew.w.kaylor updated this revision to Diff 63007.
andrew.w.kaylor added a comment.
Adding a test.
Repository:
rL LLVM
http://reviews.llvm.org/D21143
Files:
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
test/Other/X86/opt-bisect-isel.ll
Index: lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -443,7 +443,7 @@
TM.resetTargetOptions(Fn);
// Reset OptLevel to None for optnone functions.
CodeGenOpt::Level NewOptLevel = OptLevel;
- if (Fn.hasFnAttribute(Attribute::OptimizeNone))
+ if (OptLevel != CodeGenOpt::None && skipFunction(Fn))
NewOptLevel = CodeGenOpt::None;
OptLevelChanger OLC(*this, NewOptLevel);
Index: test/Other/X86/opt-bisect-isel.ll
===================================================================
--- test/Other/X86/opt-bisect-isel.ll
+++ test/Other/X86/opt-bisect-isel.ll
@@ -0,0 +1,22 @@
+; This test verifies that no optimizations are performed on the @f function
+; when the -opt-bisect-limit=0 option is used. In particular, the X86
+; instruction selector will optimize cmp instruction to a sub instruction if it
+; is not run in -O0 mode.
+
+; RUN: llc -O3 -opt-bisect-limit=0 -o - %s | FileCheck %s
+
+target triple = "x86_64-unknown-linux-gnu"
+
+define void @f() {
+entry:
+ %cmp = icmp slt i32 undef, 8
+ br i1 %cmp, label %middle, label %end
+
+middle:
+ br label %end
+
+end:
+ ret void
+}
+
+; CHECK: cmpl $8, %eax
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