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7e369d0dca
Summary: Previously we had a notion of convergent functions but not of convergent calls. This is insufficient to correctly analyze calls where the target is unknown, e.g. indirect calls. Now a call is convergent if it targets a known-convergent function, or if it's explicitly marked as convergent. As usual, we can remove convergent where we can prove that no convergent operations are performed in the call. Originally landed as r261544, then reverted in r261544 for (incidental) build breakage. Re-landed here with no changes. Reviewers: chandlerc, jingyue Subscribers: llvm-commits, tra, jhen, hfinkel Differential Revision: http://reviews.llvm.org/D17739 llvm-svn: 263481
34 lines
804 B
LLVM
34 lines
804 B
LLVM
; RUN: opt -instcombine -S < %s | FileCheck %s
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declare i32 @k() convergent
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declare i32 @f()
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define i32 @extern() {
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; Convergent attr shouldn't be removed here; k is convergent.
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; CHECK: call i32 @k() [[CONVERGENT_ATTR:#[0-9]+]]
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%a = call i32 @k() convergent
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ret i32 %a
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}
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define i32 @extern_no_attr() {
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; Convergent attr shouldn't be added here, even though k is convergent.
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; CHECK: call i32 @k(){{$}}
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%a = call i32 @k()
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ret i32 %a
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}
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define i32 @no_extern() {
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; Convergent should be removed here, as the target is convergent.
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; CHECK: call i32 @f(){{$}}
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%a = call i32 @f() convergent
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ret i32 %a
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}
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define i32 @indirect_call(i32 ()* %f) {
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; CHECK call i32 %f() [[CONVERGENT_ATTR]]
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%a = call i32 %f() convergent
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ret i32 %a
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}
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; CHECK: [[CONVERGENT_ATTR]] = { convergent }
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