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ab9b18423b
Implement the getUnrollingPreferences() function for AMDGPUTargetTransformInfo so that loops that do address calculations on pointers derived from alloca are unconditionally unrolled. Unrolling these loops makes it more likely that SROA will be able to eliminate the allocas, which is a big win for R600 since memory allocated by alloca (private memory) is really slow. llvm-svn: 199916
38 lines
1.1 KiB
LLVM
38 lines
1.1 KiB
LLVM
; RUN: opt -loop-unroll -simplifycfg -sroa %s -S -o - | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-v16:16:16-v24:32:32-v32:32:32-v48:64:64-v64:64:64-v96:128:128-v128:128:128-v192:256:256-v256:256:256-v512:512:512-v1024:1024:1024-v2048:2048:2048-n32:64"
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target triple = "r600--"
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; This test contains a simple loop that initializes an array declared in
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; private memory. We want to make sure these kinds of loops are always
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; unrolled, because private memory is slow.
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; CHECK-LABEL: @test
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; CHECK-NOT: alloca
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; CHECK: store i32 5, i32 addrspace(1)* %out
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define void @test(i32 addrspace(1)* %out) {
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entry:
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%0 = alloca [32 x i32]
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br label %loop.header
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loop.header:
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%counter = phi i32 [0, %entry], [%inc, %loop.inc]
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br label %loop.body
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loop.body:
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%ptr = getelementptr [32 x i32]* %0, i32 0, i32 %counter
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store i32 %counter, i32* %ptr
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br label %loop.inc
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loop.inc:
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%inc = add i32 %counter, 1
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%1 = icmp sge i32 %counter, 32
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br i1 %1, label %exit, label %loop.header
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exit:
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%2 = getelementptr [32 x i32]* %0, i32 0, i32 5
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%3 = load i32* %2
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store i32 %3, i32 addrspace(1)* %out
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ret void
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}
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