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https://github.com/RPCS3/llvm.git
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f27a4cd783
missing check that an array reference doesn't go past the end of the array, and remove some redundant checks for in-bound array and vector references that are no longer needed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91897 91177308-0d34-0410-b5e6-96231b3b80d8
54 lines
1.4 KiB
LLVM
54 lines
1.4 KiB
LLVM
; RUN: opt < %s -scalarrepl -S | 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-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32"
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target triple = "i386-pc-linux-gnu"
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%nested = type { i32, [4 x i32] }
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; Check that a GEP with a non-zero first index does not prevent SROA as long
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; as the resulting offset corresponds to an element in the alloca.
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define i32 @test1() {
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; CHECK: @test1
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; CHECK-NOT: = i160
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; CHECK: ret i32 undef
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%A = alloca %nested
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%B = getelementptr %nested* %A, i32 0, i32 1, i32 0
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%C = getelementptr i32* %B, i32 2
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%D = load i32* %C
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ret i32 %D
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}
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; But, if the offset is out of range, then it should not be transformed.
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define i32 @test2() {
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; CHECK: @test2
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; CHECK: i160
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%A = alloca %nested
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%B = getelementptr %nested* %A, i32 0, i32 1, i32 0
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%C = getelementptr i32* %B, i32 4
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%D = load i32* %C
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ret i32 %D
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}
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; Try it with a bitcast and single GEP....
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define i32 @test3() {
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; CHECK: @test3
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; CHECK-NOT: = i160
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; CHECK: ret i32 undef
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%A = alloca %nested
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%B = bitcast %nested* %A to i32*
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%C = getelementptr i32* %B, i32 2
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%D = load i32* %C
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ret i32 %D
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}
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; ...and again make sure that out-of-range accesses are not transformed.
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define i32 @test4() {
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; CHECK: @test4
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; CHECK: i160
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%A = alloca %nested
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%B = bitcast %nested* %A to i32*
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%C = getelementptr i32* %B, i32 -1
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%D = load i32* %C
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ret i32 %D
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}
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