6f6e9a867f
I'm not sure this is the best way to approach this, but the situation is rather not very detectable unless we explicitly call it out when refusing to advise to unroll. Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D107271
46 lines
1.5 KiB
LLVM
46 lines
1.5 KiB
LLVM
; RUN: opt -debugify -loop-unroll -mcpu=znver3 -pass-remarks=loop-unroll -pass-remarks-analysis=loop-unroll < %s -S 2>&1 | FileCheck --check-prefixes=ALL,UNROLL %s
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; RUN: opt -debugify -loop-unroll -mcpu=znver3 -pass-remarks=TTI -pass-remarks-analysis=TTI < %s -S 2>&1 | FileCheck --check-prefixes=ALL,TTI %s
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; TTI: remark: <stdin>:7:1: advising against unrolling the loop because it contains a call
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; UNROLL: remark: <stdin>:14:1: unrolled loop by a factor of 8 with run-time trip count
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define void @contains_external_call(i32 %count) {
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; ALL-LABEL: @contains_external_call(
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; ALL-NOT: unroll
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entry:
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%cmp.not3 = icmp eq i32 %count, 0
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br i1 %cmp.not3, label %for.cond.cleanup, label %for.body
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for.body:
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%i.04 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
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tail call void @sideeffect()
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%inc = add nuw nsw i32 %i.04, 1
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%cmp.not = icmp eq i32 %inc, %count
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br i1 %cmp.not, label %for.cond.cleanup, label %for.body
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for.cond.cleanup:
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ret void
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}
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declare void @sideeffect()
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define i32 @no_external_calls(i32 %count) {
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; ALL-LABEL: @no_external_calls(
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; ALL: unroll
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entry:
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%cmp.not5 = icmp eq i32 %count, 0
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br i1 %cmp.not5, label %for.end, label %for.body
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for.body:
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%i.06 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
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%inc = add nuw nsw i32 %i.06, 1
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%cmp.not = icmp eq i32 %inc, %count
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br i1 %cmp.not, label %for.end, label %for.body
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for.end:
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ret i32 %count
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}
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