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llvm-mirror/test/Transforms/InstCombine/invariant.ll

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Don't trivially delete unused calls to llvm.invariant.start. This allows llvm.invariant.start to be used without necessarily being paired with a call to llvm.invariant.end. If you run the entire optimization pipeline then such calls are in fact deleted (adce does it), but that's actually a good thing since we probably do want them to be zapped late in the game. There should really be an integration test that checks that the llvm.invariant.start call lasts long enough that all passes that do interesting things with it get to do their stuff before it is deleted. But since no passes do anything interesting with it yet this will have to wait for later. llvm-svn: 86840
2009-11-11 16:34:13 +01:00
; Test to make sure unused llvm.invariant.start calls are not trivially eliminated
; RUN: opt < %s -instcombine -S | FileCheck %s
declare void @g(i8*)
Print empty structs as {} rather than { }. llvm-svn: 100787
2010-04-08 20:03:05 +02:00
declare {}* @llvm.invariant.start(i64, i8* nocapture) nounwind readonly
Don't trivially delete unused calls to llvm.invariant.start. This allows llvm.invariant.start to be used without necessarily being paired with a call to llvm.invariant.end. If you run the entire optimization pipeline then such calls are in fact deleted (adce does it), but that's actually a good thing since we probably do want them to be zapped late in the game. There should really be an integration test that checks that the llvm.invariant.start call lasts long enough that all passes that do interesting things with it get to do their stuff before it is deleted. But since no passes do anything interesting with it yet this will have to wait for later. llvm-svn: 86840
2009-11-11 16:34:13 +01:00
define i8 @f() {
%a = alloca i8 ; <i8*> [#uses=4]
store i8 0, i8* %a
Print empty structs as {} rather than { }. llvm-svn: 100787
2010-04-08 20:03:05 +02:00
%i = call {}* @llvm.invariant.start(i64 1, i8* %a) ; <{}*> [#uses=0]
; CHECK: call {}* @llvm.invariant.start
Don't trivially delete unused calls to llvm.invariant.start. This allows llvm.invariant.start to be used without necessarily being paired with a call to llvm.invariant.end. If you run the entire optimization pipeline then such calls are in fact deleted (adce does it), but that's actually a good thing since we probably do want them to be zapped late in the game. There should really be an integration test that checks that the llvm.invariant.start call lasts long enough that all passes that do interesting things with it get to do their stuff before it is deleted. But since no passes do anything interesting with it yet this will have to wait for later. llvm-svn: 86840
2009-11-11 16:34:13 +01:00
call void @g(i8* %a)
%r = load i8* %a ; <i8> [#uses=1]
ret i8 %r
}
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