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This option allows loops with small max trip counts to be fully unrolled. This can help with code like the remainder loops from manually unrolled loops like those that appear in the cmsis dsp library. We would apparently previously runtime unroll them with the default unroll count (4). Differential Revision: https://reviews.llvm.org/D63064 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362928 91177308-0d34-0410-b5e6-96231b3b80d8
39 lines
1.3 KiB
LLVM
39 lines
1.3 KiB
LLVM
; RUN: opt -loop-unroll -S -mtriple arm-none-eabi -mcpu=cortex-m7 %s | FileCheck %s -check-prefix=UNROLL
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; This test is meant to check that this loop is unrolled into three iterations.
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; UNROLL-LABEL: @test
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; UNROLL: load i32, i32*
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; UNROLL: load i32, i32*
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; UNROLL: load i32, i32*
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; UNROLL-NOT: load i32, i32*
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define void @test(i32* %x, i32 %n) {
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entry:
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%sub = add nsw i32 %n, -1
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%rem = srem i32 %sub, 4
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%cmp7 = icmp sgt i32 %rem, 0
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br i1 %cmp7, label %while.body, label %while.end
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while.body: ; preds = %entry, %if.end
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%x.addr.09 = phi i32* [ %incdec.ptr, %if.end ], [ %x, %entry ]
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%n.addr.08 = phi i32 [ %dec, %if.end ], [ %rem, %entry ]
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%0 = load i32, i32* %x.addr.09, align 4
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%cmp1 = icmp slt i32 %0, 10
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br i1 %cmp1, label %if.then, label %if.end
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if.then: ; preds = %while.body
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store i32 0, i32* %x.addr.09, align 4
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br label %if.end
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if.end: ; preds = %if.then, %while.body
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%incdec.ptr = getelementptr inbounds i32, i32* %x.addr.09, i32 1
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%dec = add nsw i32 %n.addr.08, -1
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%cmp = icmp sgt i32 %dec, 0
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br i1 %cmp, label %while.body, label %while.end
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while.end: ; preds = %if.end, %entry
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ret void
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}
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