Add support for missed and analysis optimization remarks.

Summary:
This adds two new diagnostics: -pass-remarks-missed and
-pass-remarks-analysis. They take the same values as -pass-remarks but
are intended to be triggered in different contexts.

-pass-remarks-missed is used by LLVMContext::emitOptimizationRemarkMissed,
which passes call when they tried to apply a transformation but
couldn't.

-pass-remarks-analysis is used by LLVMContext::emitOptimizationRemarkAnalysis,
which passes call when they want to inform the user about analysis
results.

The patch also:

1- Adds support in the inliner for the two new remarks and a
   test case.

2- Moves emitOptimizationRemark* functions to the llvm namespace.

3- Adds an LLVMContext argument instead of making them member functions
   of LLVMContext.

Reviewers: qcolombet

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D3682

llvm-svn: 209442

1 files changed, 60 insertions, 0 deletions

diff --git a/llvm/test/Transforms/Inline/optimization-remarks.ll b/llvm/test/Transforms/Inline/optimization-remarks.ll
new file mode 100644
index 00000000000..9108f3ab14d
--- /dev/null
+++ b/llvm/test/Transforms/Inline/optimization-remarks.ll
@@ -0,0 +1,60 @@
+; RUN: opt < %s -inline -pass-remarks=inline -pass-remarks-missed=inline -pass-remarks-analysis=inline -S 2>&1 | FileCheck %s
+
+; CHECK: foo should always be inlined (cost=always)
+; CHECK: foo inlined into bar
+; CHECK: foz should never be inlined (cost=never)
+; CHECK: foz will not be inlined into bar
+
+; Function Attrs: alwaysinline nounwind uwtable
+define i32 @foo(i32 %x, i32 %y) #0 {
+entry:
+  %x.addr = alloca i32, align 4
+  %y.addr = alloca i32, align 4
+  store i32 %x, i32* %x.addr, align 4
+  store i32 %y, i32* %y.addr, align 4
+  %0 = load i32* %x.addr, align 4
+  %1 = load i32* %y.addr, align 4
+  %add = add nsw i32 %0, %1
+  ret i32 %add
+}
+
+; Function Attrs: noinline nounwind uwtable
+define float @foz(i32 %x, i32 %y) #1 {
+entry:
+  %x.addr = alloca i32, align 4
+  %y.addr = alloca i32, align 4
+  store i32 %x, i32* %x.addr, align 4
+  store i32 %y, i32* %y.addr, align 4
+  %0 = load i32* %x.addr, align 4
+  %1 = load i32* %y.addr, align 4
+  %mul = mul nsw i32 %0, %1
+  %conv = sitofp i32 %mul to float
+  ret float %conv
+}
+
+; Function Attrs: nounwind uwtable
+define i32 @bar(i32 %j) #2 {
+entry:
+  %j.addr = alloca i32, align 4
+  store i32 %j, i32* %j.addr, align 4
+  %0 = load i32* %j.addr, align 4
+  %1 = load i32* %j.addr, align 4
+  %sub = sub nsw i32 %1, 2
+  %call = call i32 @foo(i32 %0, i32 %sub)
+  %conv = sitofp i32 %call to float
+  %2 = load i32* %j.addr, align 4
+  %sub1 = sub nsw i32 %2, 2
+  %3 = load i32* %j.addr, align 4
+  %call2 = call float @foz(i32 %sub1, i32 %3)
+  %mul = fmul float %conv, %call2
+  %conv3 = fptosi float %mul to i32
+  ret i32 %conv3
+}
+
+attributes #0 = { alwaysinline nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { noinline nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #2 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.ident = !{!0}
+
+!0 = metadata !{metadata !"clang version 3.5.0 "}