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Add store Merge test. 

llvm-svn: 300551
This commit is contained in:
Nirav Dave 2017-04-18 13:25:19 +00:00
parent 692dc54b0d
commit b97768499f
1 changed files with 25 additions and 0 deletions
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25
llvm/test/CodeGen/X86/MergeConsecutiveStores.ll
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@ -582,3 +582,28 @@ define void @merge_vec_element_and_scalar_load([6 x i64]* %array) {
; CHECK-NEXT: movq %rcx, 40(%rdi)
; CHECK-NEXT: retq
}
; Don't let a non-consecutive store thwart merging of the last two.
define void @almost_consecutive_stores(i8* %p) {
store i8 0, i8* %p
%p1 = getelementptr i8, i8* %p, i64 42
store i8 1, i8* %p1
%p2 = getelementptr i8, i8* %p, i64 2
store i8 2, i8* %p2
%p3 = getelementptr i8, i8* %p, i64 3
store i8 3, i8* %p3
ret void
; CHECK-LABEL: almost_consecutive_stores
; CHECK-DAG: movb $0, (%rdi)
; CHECK-DAG: movb $1, 42(%rdi)
; CHECK-DAG: movb $2, 2(%rdi)
; CHECK-DAG: movb $3, 3(%rdi)
; CHECK: retq
; We should able to merge the final two stores into a 16-bit store
; FIXMECHECK-DAG: movw $770, 2(%rdi)
}