xref: /aosp_15_r20/external/llvm/test/Transforms/LoadCombine/load-combine-negativegep.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58) 
1*9880d681SAndroid Build Coastguard Worker; RUN: opt -basicaa -load-combine -S < %s | FileCheck %s
2*9880d681SAndroid Build Coastguard Workertarget datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
3*9880d681SAndroid Build Coastguard Workertarget triple = "x86_64-unknown-linux-gnu"
4*9880d681SAndroid Build Coastguard Worker
5*9880d681SAndroid Build Coastguard Workerdefine i32 @Load_NegGep(i32* %i){
6*9880d681SAndroid Build Coastguard Worker  %1 = getelementptr inbounds i32, i32* %i, i64 -1
7*9880d681SAndroid Build Coastguard Worker  %2 = load i32, i32* %1, align 4
8*9880d681SAndroid Build Coastguard Worker  %3 = load i32, i32* %i, align 4
9*9880d681SAndroid Build Coastguard Worker  %4 = add nsw i32 %3, %2
10*9880d681SAndroid Build Coastguard Worker  ret i32 %4
11*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @Load_NegGep(
12*9880d681SAndroid Build Coastguard Worker; CHECK:  %[[load:.*]] = load i64
13*9880d681SAndroid Build Coastguard Worker; CHECK:  %[[combine_extract_lo:.*]] = trunc i64 %[[load]] to i32
14*9880d681SAndroid Build Coastguard Worker; CHECK:  %[[combine_extract_shift:.*]] = lshr i64 %[[load]], 32
15*9880d681SAndroid Build Coastguard Worker; CHECK:  %[[combine_extract_hi:.*]] = trunc i64 %[[combine_extract_shift]] to i32
16*9880d681SAndroid Build Coastguard Worker; CHECK:  %[[add:.*]] = add nsw i32 %[[combine_extract_hi]], %[[combine_extract_lo]]
17*9880d681SAndroid Build Coastguard Worker}
18*9880d681SAndroid Build Coastguard Worker
19*9880d681SAndroid Build Coastguard Worker
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