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0d10a020ff
Before r268509, Clang would disable the loop unroll pass when optimizing for size. That commit enabled it to be able to support unroll pragmas in -Os builds. However, this regressed binary size in one of Chromium's DLLs with ~100 KB. This restores the original behaviour of no unrolling at -Os, but doing it in LLVM instead of Clang makes more sense, and also allows the pragmas to keep working. Differential revision: http://reviews.llvm.org/D20115 llvm-svn: 269124
131 lines
3.5 KiB
LLVM
131 lines
3.5 KiB
LLVM
; RUN: opt < %s -S -loop-unroll -unroll-count=4 | FileCheck -check-prefix=CHECK_COUNT4 %s
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; RUN: opt < %s -S -loop-unroll | FileCheck -check-prefix=CHECK_NOCOUNT %s
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;///////////////////// TEST 1 //////////////////////////////
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; This test shows that the loop is unrolled according to the specified
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; unroll factor.
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define void @Test1() nounwind {
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entry:
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br label %loop
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loop:
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%iv = phi i32 [ 0, %entry ], [ %inc, %loop ]
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%inc = add i32 %iv, 1
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%exitcnd = icmp uge i32 %inc, 1024
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br i1 %exitcnd, label %exit, label %loop
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exit:
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ret void
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}
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; CHECK_COUNT4-LABEL: @Test1
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; CHECK_COUNT4: phi
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; CHECK_COUNT4-NEXT: add
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; CHECK_COUNT4-NEXT: add
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; CHECK_COUNT4-NEXT: add
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; CHECK_COUNT4-NEXT: add
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; CHECK_COUNT4-NEXT: icmp
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;///////////////////// TEST 2 //////////////////////////////
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; This test shows that with optnone attribute, the loop is not unrolled
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; even if an unroll factor was specified.
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define void @Test2() nounwind optnone noinline {
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entry:
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br label %loop
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loop:
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%iv = phi i32 [ 0, %entry ], [ %inc, %loop ]
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%inc = add i32 %iv, 1
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%exitcnd = icmp uge i32 %inc, 1024
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br i1 %exitcnd, label %exit, label %loop
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exit:
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ret void
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}
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; CHECK_COUNT4-LABEL: @Test2
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; CHECK_COUNT4: phi
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; CHECK_COUNT4-NEXT: add
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; CHECK_COUNT4-NEXT: icmp
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;///////////////////// TEST 3 //////////////////////////////
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; This test shows that this loop is fully unrolled by default.
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@tab = common global [24 x i32] zeroinitializer, align 4
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define i32 @Test3() {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%i.05 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%arrayidx = getelementptr inbounds [24 x i32], [24 x i32]* @tab, i32 0, i32 %i.05
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store i32 %i.05, i32* %arrayidx, align 4
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%inc = add nuw nsw i32 %i.05, 1
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%exitcond = icmp eq i32 %inc, 24
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret i32 42
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}
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; CHECK_NOCOUNT-LABEL: @Test3
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; CHECK_NOCOUNT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: store
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; CHECK_NOCOUNT-NEXT: ret
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;///////////////////// TEST 4 //////////////////////////////
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; This test shows that with optsize attribute, this loop is not unrolled.
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define i32 @Test4() optsize {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%i.05 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%arrayidx = getelementptr inbounds [24 x i32], [24 x i32]* @tab, i32 0, i32 %i.05
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store i32 %i.05, i32* %arrayidx, align 4
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%inc = add nuw nsw i32 %i.05, 1
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%exitcond = icmp eq i32 %inc, 24
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret i32 42
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}
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; CHECK_NOCOUNT-LABEL: @Test4
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; CHECK_NOCOUNT: phi
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; CHECK_NOCOUNT: icmp
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