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[inliner] Fix PR18206 by preventing inlining functions that call setjmp

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through an invoke instruction.

The original patch for this was written by Mark Seaborn, but I've
reworked his test case into the existing returns_twice test case and
implemented the fix by the prior refactoring to actually run the cost
analysis over invoke instructions, and then here fixing our detection of
the returns_twice attribute to work for both calls and invokes. We never
noticed because we never saw an invoke. =[

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197216 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2013-12-13 08:00:01 +00:00
parent 0bdc7cd5de
commit a7e2ef7e6e
2 changed files with 58 additions and 15 deletions
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2
lib/Analysis/IPA/InlineCost.cpp
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@ -713,7 +713,7 @@ bool CallAnalyzer::simplifyCallSite(Function *F, CallSite CS) {
}
bool CallAnalyzer::visitCallSite(CallSite CS) {
if (CS.isCall() && cast<CallInst>(CS.getInstruction())->canReturnTwice() &&
if (CS.hasFnAttr(Attribute::ReturnsTwice) &&
!F.getAttributes().hasAttribute(AttributeSet::FunctionIndex,
Attribute::ReturnsTwice)) {
// This aborts the entire analysis.

71
test/Transforms/Inline/inline_returns_twice.ll
View File

@ -4,38 +4,81 @@
; if they are themselves marked as such.
declare i32 @a() returns_twice
declare i32 @b() returns_twice
define i32 @f() {
define i32 @inner1() {
entry:
%call = call i32 @a() returns_twice
%add = add nsw i32 1, %call
ret i32 %add
}
define i32 @g() {
define i32 @outer1() {
entry:
; CHECK-LABEL: define i32 @g(
; CHECK: call i32 @f()
; CHECK-NOT: call i32 @a()
%call = call i32 @f()
; CHECK-LABEL: define i32 @outer1(
; CHECK: call i32 @inner1()
%call = call i32 @inner1()
%add = add nsw i32 1, %call
ret i32 %add
}
define i32 @h() returns_twice {
define i32 @inner2() returns_twice {
entry:
%call = call i32 @b() returns_twice
%call = call i32 @a() returns_twice
%add = add nsw i32 1, %call
ret i32 %add
}
define i32 @i() {
define i32 @outer2() {
entry:
; CHECK-LABEL: define i32 @i(
; CHECK: call i32 @b()
; CHECK-NOT: call i32 @h()
%call = call i32 @h() returns_twice
; CHECK-LABEL: define i32 @outer2(
; CHECK: call i32 @a()
%call = call i32 @inner2() returns_twice
%add = add nsw i32 1, %call
ret i32 %add
}
define i32 @inner3() {
entry:
%invoke = invoke i32 @a() returns_twice
to label %cont unwind label %lpad
cont:
%add = add nsw i32 1, %invoke
ret i32 %add
lpad:
%lp = landingpad i32 personality i8* null cleanup
resume i32 %lp
}
define i32 @outer3() {
entry:
; CHECK-LABEL: define i32 @outer3(
; CHECK: call i32 @inner3()
%call = call i32 @inner3()
%add = add nsw i32 1, %call
ret i32 %add
}
define i32 @inner4() returns_twice {
entry:
%invoke = invoke i32 @a() returns_twice
to label %cont unwind label %lpad
cont:
%add = add nsw i32 1, %invoke
ret i32 %add
lpad:
%lp = landingpad i32 personality i8* null cleanup
resume i32 %lp
}
define i32 @outer4() {
entry:
; CHECK-LABEL: define i32 @outer4(
; CHECK: invoke i32 @a()
%call = call i32 @inner4() returns_twice
%add = add nsw i32 1, %call
ret i32 %add
}