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improve optimization of invoke instructions:

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- simplifycfg:  invoke undef/null -> unreachable
 - instcombine:  invoke new  -> invoke expect(0, 0)  (an arbitrary NOOP intrinsic;  only done if the allocated memory is unused, of course)
 - verifier:  allow invoke of intrinsics  (to make the previous step work)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159146 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nuno Lopes
2012-06-25 17:11:47 +00:00
parent e8742d084c
commit 3769fe149b
5 changed files with 63 additions and 5 deletions
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45
test/Transforms/SimplifyCFG/invoke.ll Normal file
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; RUN: opt < %s -simplifycfg -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
declare i32 @__gxx_personality_v0(...)
declare void @__cxa_call_unexpected(i8*)
declare i64 @llvm.objectsize.i64(i8*, i1) nounwind readonly
; CHECK: @f1
define i8* @f1() nounwind uwtable ssp {
entry:
; CHECK: call void @llvm.trap()
; CHECK: unreachable
%call = invoke noalias i8* undef()
to label %invoke.cont unwind label %lpad
invoke.cont:
ret i8* %call
lpad:
%0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
filter [0 x i8*] zeroinitializer
%1 = extractvalue { i8*, i32 } %0, 0
tail call void @__cxa_call_unexpected(i8* %1) noreturn nounwind
unreachable
}
; CHECK: @f2
define i8* @f2() nounwind uwtable ssp {
entry:
; CHECK: call void @llvm.trap()
; CHECK: unreachable
%call = invoke noalias i8* null()
to label %invoke.cont unwind label %lpad
invoke.cont:
ret i8* %call
lpad:
%0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
filter [0 x i8*] zeroinitializer
%1 = extractvalue { i8*, i32 } %0, 0
tail call void @__cxa_call_unexpected(i8* %1) noreturn nounwind
unreachable
}