1 ; RUN: llc < %s -march=x86-64 -mcpu=corei7 -mtriple=x86_64-pc-win64 | FileCheck %s 2 3 ; CHECK: merge_stores_can 4 ; CHECK: callq foo 5 ; CHECK-NEXT: xorps %xmm0, %xmm0 6 ; CHECK-NEXT: movups %xmm0 7 ; CHECK: callq foo 8 ; CHECK: ret 9 declare i32 @foo([10 x i32]* ) 10 11 define i32 @merge_stores_can() nounwind ssp { 12 %object1 = alloca [10 x i32] 13 14 %ret0 = call i32 @foo([10 x i32]* %object1) nounwind 15 16 %O1_1 = getelementptr [10 x i32]* %object1, i64 0, i32 1 17 %O1_2 = getelementptr [10 x i32]* %object1, i64 0, i32 2 18 %O1_3 = getelementptr [10 x i32]* %object1, i64 0, i32 3 19 %O1_4 = getelementptr [10 x i32]* %object1, i64 0, i32 4 20 %ld_ptr = getelementptr [10 x i32]* %object1, i64 0, i32 9 21 22 store i32 0, i32* %O1_1 23 store i32 0, i32* %O1_2 24 %ret = load i32* %ld_ptr ; <--- does not alias. 25 store i32 0, i32* %O1_3 26 store i32 0, i32* %O1_4 27 28 %ret1 = call i32 @foo([10 x i32]* %object1) nounwind 29 30 ret i32 %ret 31 } 32 33 ; CHECK: merge_stores_cant 34 ; CHECK-NOT: xorps %xmm0, %xmm0 35 ; CHECK-NOT: movups %xmm0 36 ; CHECK: ret 37 define i32 @merge_stores_cant([10 x i32]* %in0, [10 x i32]* %in1) nounwind ssp { 38 39 %O1_1 = getelementptr [10 x i32]* %in1, i64 0, i32 1 40 %O1_2 = getelementptr [10 x i32]* %in1, i64 0, i32 2 41 %O1_3 = getelementptr [10 x i32]* %in1, i64 0, i32 3 42 %O1_4 = getelementptr [10 x i32]* %in1, i64 0, i32 4 43 %ld_ptr = getelementptr [10 x i32]* %in0, i64 0, i32 2 44 45 store i32 0, i32* %O1_1 46 store i32 0, i32* %O1_2 47 %ret = load i32* %ld_ptr ; <--- may alias 48 store i32 0, i32* %O1_3 49 store i32 0, i32* %O1_4 50 51 ret i32 %ret 52 } 53
