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: xorps %xmm0, %xmm0 6 ; CHECK-NEXT: movl 36(%rsp), %ebp 7 ; CHECK-NEXT: movups %xmm0 8 ; CHECK: callq foo 9 ; CHECK: ret 10 declare i32 @foo([10 x i32]* ) 11 12 define i32 @merge_stores_can() nounwind ssp { 13 %object1 = alloca [10 x i32] 14 15 %ret0 = call i32 @foo([10 x i32]* %object1) nounwind 16 17 %O1_1 = getelementptr [10 x i32], [10 x i32]* %object1, i64 0, i32 1 18 %O1_2 = getelementptr [10 x i32], [10 x i32]* %object1, i64 0, i32 2 19 %O1_3 = getelementptr [10 x i32], [10 x i32]* %object1, i64 0, i32 3 20 %O1_4 = getelementptr [10 x i32], [10 x i32]* %object1, i64 0, i32 4 21 %ld_ptr = getelementptr [10 x i32], [10 x i32]* %object1, i64 0, i32 9 22 23 store i32 0, i32* %O1_1 24 store i32 0, i32* %O1_2 25 %ret = load i32, i32* %ld_ptr ; <--- does not alias. 26 store i32 0, i32* %O1_3 27 store i32 0, i32* %O1_4 28 29 %ret1 = call i32 @foo([10 x i32]* %object1) nounwind 30 31 ret i32 %ret 32 } 33 34 ; CHECK: merge_stores_cant 35 ; CHECK-NOT: xorps %xmm0, %xmm0 36 ; CHECK-NOT: movups %xmm0 37 ; CHECK: ret 38 define i32 @merge_stores_cant([10 x i32]* %in0, [10 x i32]* %in1) nounwind ssp { 39 40 %O1_1 = getelementptr [10 x i32], [10 x i32]* %in1, i64 0, i32 1 41 %O1_2 = getelementptr [10 x i32], [10 x i32]* %in1, i64 0, i32 2 42 %O1_3 = getelementptr [10 x i32], [10 x i32]* %in1, i64 0, i32 3 43 %O1_4 = getelementptr [10 x i32], [10 x i32]* %in1, i64 0, i32 4 44 %ld_ptr = getelementptr [10 x i32], [10 x i32]* %in0, i64 0, i32 2 45 46 store i32 0, i32* %O1_1 47 store i32 0, i32* %O1_2 48 %ret = load i32, i32* %ld_ptr ; <--- may alias 49 store i32 0, i32* %O1_3 50 store i32 0, i32* %O1_4 51 52 ret i32 %ret 53 } 54
