derek.holloway
7502bf64a4
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45 lines
1.3 KiB
LLVM
45 lines
1.3 KiB
LLVM
; RUN: opt -passes=loop-unroll -S -mtriple aarch64 -mcpu=cortex-a57 %s | FileCheck %s -check-prefix=UNROLL
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; RUN: opt -passes=loop-unroll -unroll-max-upperbound=0 -S -mtriple aarch64 -mcpu=cortex-a57 %s | FileCheck %s -check-prefix=NOUNROLL
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; This IR comes from this C code:
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;
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; for (int i = 0; i < 4; i++) {
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; if (src[i] == 1) {
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; *dst = i;
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; break;
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; }
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; }
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;
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; This test is meant to check that this loop is unrolled into four iterations.
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; Note that the load on the last iteration is dead and thus doesn't appear in
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; the output.
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; UNROLL-LABEL: @test
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; UNROLL: load i32, ptr
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; UNROLL: load i32, ptr
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; UNROLL: load i32, ptr
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; UNROLL-NOT: load i32, ptr
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; NOUNROLL-LABEL: @test
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; NOUNROLL: load i32, ptr
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; NOUNROLL-NOT: load i32, ptr
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define void @test(ptr %dst, ptr %src) {
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entry:
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br label %for.body
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for.body: ; preds = %entry, %for.body
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%i = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%0 = sext i32 %i to i64
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%1 = getelementptr inbounds i32, ptr %src, i64 %0
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%2 = load i32, ptr %1
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%inc = add nsw i32 %i, 1
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%cmp1 = icmp slt i32 %inc, 4
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%cmp3 = icmp eq i32 %2, 1
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%or.cond = and i1 %cmp3, %cmp1
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br i1 %or.cond, label %for.body, label %exit
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exit: ; preds = %for.body
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store i32 %i, ptr %dst
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ret void
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}
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