derek.holloway
7502bf64a4
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54 lines
1.5 KiB
LLVM
54 lines
1.5 KiB
LLVM
; RUN: llc < %s -mcpu=corei7 -mtriple=x86_64-pc-win64 | FileCheck %s
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; CHECK: merge_stores_can
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; CHECK: callq foo
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; CHECK: xorps %xmm0, %xmm0
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; CHECK-NEXT: movups %xmm0
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; CHECK-NEXT: movl 36(%rsp), %ebp
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; CHECK: callq foo
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; CHECK: ret
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declare i32 @foo(ptr )
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define i32 @merge_stores_can() nounwind ssp {
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%object1 = alloca [10 x i32]
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%ret0 = call i32 @foo(ptr %object1) nounwind
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%O1_1 = getelementptr [10 x i32], ptr %object1, i64 0, i32 1
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%O1_2 = getelementptr [10 x i32], ptr %object1, i64 0, i32 2
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%O1_3 = getelementptr [10 x i32], ptr %object1, i64 0, i32 3
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%O1_4 = getelementptr [10 x i32], ptr %object1, i64 0, i32 4
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%ld_ptr = getelementptr [10 x i32], ptr %object1, i64 0, i32 9
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store i32 0, ptr %O1_1
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store i32 0, ptr %O1_2
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%ret = load i32, ptr %ld_ptr ; <--- does not alias.
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store i32 0, ptr %O1_3
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store i32 0, ptr %O1_4
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%ret1 = call i32 @foo(ptr %object1) nounwind
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ret i32 %ret
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}
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; CHECK: merge_stores_cant
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; CHECK-NOT: xorps %xmm0, %xmm0
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; CHECK-NOT: movups %xmm0
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; CHECK: ret
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define i32 @merge_stores_cant(ptr %in0, ptr %in1) nounwind ssp {
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%O1_1 = getelementptr [10 x i32], ptr %in1, i64 0, i32 1
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%O1_2 = getelementptr [10 x i32], ptr %in1, i64 0, i32 2
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%O1_3 = getelementptr [10 x i32], ptr %in1, i64 0, i32 3
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%O1_4 = getelementptr [10 x i32], ptr %in1, i64 0, i32 4
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%ld_ptr = getelementptr [10 x i32], ptr %in0, i64 0, i32 2
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store i32 0, ptr %O1_1
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store i32 0, ptr %O1_2
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%ret = load i32, ptr %ld_ptr ; <--- may alias
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store i32 0, ptr %O1_3
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store i32 0, ptr %O1_4
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ret i32 %ret
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}
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