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b6d4024f9b
For some targets the LICM pass can result in sub-optimal code in some cases where it would be better not to run the pass, but it isn't always possible to suppress the transformations heuristically. Where the front-end has insight into such cases it is beneficial to attach loop metadata to disable the pass - this change adds the llvm.licm.disable metadata to enable that. Differential Revision: https://reviews.llvm.org/D64557 llvm-svn: 368296
34 lines
1.0 KiB
LLVM
34 lines
1.0 KiB
LLVM
; RUN: opt < %s -S -basicaa -licm | FileCheck %s
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; Check that the LICM pass does not operate on a loop which has the
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; llvm.licm.disable metadata.
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; CHECK-LABEL: @licm_disable
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; CHECK: entry:
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; CHECK-NOT: load
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; CHECK: do.body:
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; CHECK: load i64, i64* bitcast (i32** @in to i64*)
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc"
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@in = internal unnamed_addr global i32* null, align 8
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@out = internal unnamed_addr global i32* null, align 8
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define void @licm_disable(i32 %N) {
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entry:
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br label %do.body
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do.body: ; preds = %entry
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %do.body ]
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%v1 = load i64, i64* bitcast (i32** @in to i64*), align 8
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store i64 %v1, i64* bitcast (i32** @out to i64*), align 8
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%inc = add nsw i32 %i.0, 1
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%cmp = icmp slt i32 %inc, %N
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br i1 %cmp, label %do.body, label %do.end, !llvm.loop !1
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do.end: ; preds = %do.body
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ret void
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}
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!1 = !{!1, !2}
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!2 = !{!"llvm.licm.disable"}
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