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76e07d8ba5
This patch adds `nocallback` attributes for string/math libcalls. It allows FuncAttributor to infer `norecurse` more precisely and encourages more aggressive global optimization.
20 lines
480 B
LLVM
20 lines
480 B
LLVM
; RUN: opt -S -passes='inferattrs,function(loop-mssa(licm))' < %s | FileCheck %s
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define void @test(ptr noalias %loc, ptr noalias %a) {
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; CHECK-LABEL: @test
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; CHECK: @strlen
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; CHECK-LABEL: loop:
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br label %loop
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loop:
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%res = call i64 @strlen(ptr %a)
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store i64 %res, ptr %loc
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br label %loop
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}
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; CHECK: declare i64 @strlen(ptr captures(none)) #0
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; CHECK: attributes #0 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: read) }
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declare i64 @strlen(ptr)
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