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3b791814db
Summary: This intrinsic, together with deoptimization operand bundles, allow frontends to express transfer of control and frame-local state from one (typically more specialized, hence faster) version of a function into another (typically more generic, hence slower) version. In languages with a fully integrated managed runtime this intrinsic can be used to implement "uncommon trap" like functionality. In unmanaged languages like C and C++, this intrinsic can be used to represent the slow paths of specialized functions. Note: this change does not address how `@llvm.experimental_deoptimize` is lowered. That will be done in a later change. Reviewers: chandlerc, rnk, atrick, reames Subscribers: llvm-commits, kmod, mjacob, maksfb, mcrosier, JosephTremoulet Differential Revision: http://reviews.llvm.org/D17732 llvm-svn: 263281
43 lines
1.1 KiB
LLVM
43 lines
1.1 KiB
LLVM
; RUN: not opt -verify < %s 2>&1 | FileCheck %s
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declare i8 @llvm.experimental.deoptimize.i8(...)
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declare void @llvm.experimental.deoptimize.isVoid(...)
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declare void @unknown()
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define void @f_notail() {
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entry:
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call void(...) @llvm.experimental.deoptimize.isVoid(i32 0) [ "deopt"() ]
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; CHECK: calls to experimental_deoptimize must be followed by a return
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call void @unknown()
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ret void
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}
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define void @f_nodeopt() {
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entry:
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call void(...) @llvm.experimental.deoptimize.isVoid()
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; CHECK: experimental_deoptimize must have exactly one "deopt" operand bundle
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ret void
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}
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define void @f_invoke() personality i8 3 {
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entry:
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invoke void(...) @llvm.experimental.deoptimize.isVoid(i32 0, float 0.0) to label %ok unwind label %not_ok
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; CHECK: experimental_deoptimize cannot be invoked
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ok:
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ret void
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not_ok:
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%0 = landingpad { i8*, i32 }
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filter [0 x i8*] zeroinitializer
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ret void
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}
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define i8 @f_incorrect_return() {
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entry:
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%val = call i8(...) @llvm.experimental.deoptimize.i8() [ "deopt"() ]
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; CHECK: calls to experimental_deoptimize must be followed by a return of the value computed by experimental_deoptimize
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ret i8 0
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}
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