273c299d5d
This patch adds -f[no-]split-cold-code CC1 options to clang. This allows the splitting pass to be toggled on/off. The current method of passing `-mllvm -hot-cold-split=true` to clang isn't ideal as it may not compose correctly (say, with `-O0` or `-Oz`). To implement the -fsplit-cold-code option, an attribute is applied to functions to indicate that they may be considered for splitting. This removes some complexity from the old/new PM pipeline builders, and behaves as expected when LTO is enabled. Co-authored by: Saleem Abdulrasool <compnerd@compnerd.org> Differential Revision: https://reviews.llvm.org/D57265 Reviewed By: Aditya Kumar, Vedant Kumar Reviewers: Teresa Johnson, Aditya Kumar, Fedor Sergeev, Philip Pfaffe, Vedant Kumar
30 lines
776 B
LLVM
30 lines
776 B
LLVM
; RUN: opt -passes="function(slp-vectorizer),module(hotcoldsplit),function(slp-vectorizer,print<assumptions>)" -disable-output %s 2>&1 | FileCheck %s
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;
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; Make sure this compiles. Check that function assumption cache is refreshed
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; after extracting blocks with assume calls from the function.
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; CHECK: Cached assumptions for function: fun
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; CHECK-NEXT: Cached assumptions for function: fun.cold
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; CHECK-NOT: icmp uge
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declare void @fun2(i32) #0
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define void @fun(i32 %x) "hot-cold-split" {
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entry:
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br i1 undef, label %if.then, label %if.else
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if.then:
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ret void
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if.else:
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%cmp = icmp uge i32 %x, 64
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call void @llvm.assume(i1 %cmp)
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call void @fun2(i32 %x)
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unreachable
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}
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declare void @llvm.assume(i1) #1
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attributes #0 = { alwaysinline }
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attributes #1 = { nounwind }
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