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[MemCpyOpt] Add tests for call slot optimization with GEPs (NFC)

This commit is contained in:
Nikita Popov 2020-10-04 22:25:28 +02:00
parent f05173d0bf
commit 8aaa731349
1 changed files with 58 additions and 1 deletions
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59
llvm/test/Transforms/MemCpyOpt/callslot.ll
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@ -87,7 +87,6 @@ define void @write_src_between_call_and_memcpy() {
ret void
}
; TODO: This is a miscompile.
define void @throw_between_call_and_mempy(i8* dereferenceable(16) %dest.i8) {
; CHECK-LABEL: @throw_between_call_and_mempy(
; CHECK-NEXT: [[SRC:%.*]] = alloca [16 x i8], align 1
@ -106,6 +105,64 @@ define void @throw_between_call_and_mempy(i8* dereferenceable(16) %dest.i8) {
ret void
}
define void @dest_is_gep_nounwind_call() {
; CHECK-LABEL: @dest_is_gep_nounwind_call(
; CHECK-NEXT: [[DEST:%.*]] = alloca [16 x i8], align 1
; CHECK-NEXT: [[SRC:%.*]] = alloca [8 x i8], align 1
; CHECK-NEXT: [[SRC_I8:%.*]] = bitcast [8 x i8]* [[SRC]] to i8*
; CHECK-NEXT: [[DEST_I8:%.*]] = getelementptr [16 x i8], [16 x i8]* [[DEST]], i64 0, i64 8
; CHECK-NEXT: call void @accept_ptr(i8* [[SRC_I8]]) [[ATTR3:#.*]]
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[DEST_I8]], i8* [[SRC_I8]], i64 8, i1 false)
; CHECK-NEXT: ret void
;
%dest = alloca [16 x i8]
%src = alloca [8 x i8]
%src.i8 = bitcast [8 x i8]* %src to i8*
%dest.i8 = getelementptr [16 x i8], [16 x i8]* %dest, i64 0, i64 8
call void @accept_ptr(i8* %src.i8) nounwind
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dest.i8, i8* %src.i8, i64 8, i1 false)
ret void
}
define void @dest_is_gep_may_throw_call() {
; CHECK-LABEL: @dest_is_gep_may_throw_call(
; CHECK-NEXT: [[DEST:%.*]] = alloca [16 x i8], align 1
; CHECK-NEXT: [[SRC:%.*]] = alloca [8 x i8], align 1
; CHECK-NEXT: [[SRC_I8:%.*]] = bitcast [8 x i8]* [[SRC]] to i8*
; CHECK-NEXT: [[DEST_I8:%.*]] = getelementptr [16 x i8], [16 x i8]* [[DEST]], i64 0, i64 8
; CHECK-NEXT: call void @accept_ptr(i8* [[SRC_I8]])
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[DEST_I8]], i8* [[SRC_I8]], i64 8, i1 false)
; CHECK-NEXT: ret void
;
%dest = alloca [16 x i8]
%src = alloca [8 x i8]
%src.i8 = bitcast [8 x i8]* %src to i8*
%dest.i8 = getelementptr [16 x i8], [16 x i8]* %dest, i64 0, i64 8
call void @accept_ptr(i8* %src.i8)
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dest.i8, i8* %src.i8, i64 8, i1 false)
ret void
}
define void @dest_is_gep_requires_movement() {
; CHECK-LABEL: @dest_is_gep_requires_movement(
; CHECK-NEXT: [[DEST:%.*]] = alloca [16 x i8], align 1
; CHECK-NEXT: [[SRC:%.*]] = alloca [8 x i8], align 1
; CHECK-NEXT: [[SRC_I8:%.*]] = bitcast [8 x i8]* [[SRC]] to i8*
; CHECK-NEXT: call void @accept_ptr(i8* [[SRC_I8]]) [[ATTR3]]
; CHECK-NEXT: [[DEST_I8:%.*]] = getelementptr [16 x i8], [16 x i8]* [[DEST]], i64 0, i64 8
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[DEST_I8]], i8* [[SRC_I8]], i64 8, i1 false)
; CHECK-NEXT: ret void
;
%dest = alloca [16 x i8]
%src = alloca [8 x i8]
%src.i8 = bitcast [8 x i8]* %src to i8*
call void @accept_ptr(i8* %src.i8) nounwind
%dest.i8 = getelementptr [16 x i8], [16 x i8]* %dest, i64 0, i64 8
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dest.i8, i8* %src.i8, i64 8, i1 false)
ret void
}
declare void @may_throw()
declare void @accept_ptr(i8*)
declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i1)
declare void @llvm.memset.p0i8.i64(i8*, i8, i64, i1)