forked from OSchip/llvm-project
77 lines
2.5 KiB
LLVM
77 lines
2.5 KiB
LLVM
; Make sure that the CGSCC pass manager can handle when instcombine simplifies
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; one libcall into an unrelated libcall and update the call graph accordingly.
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;
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; Also check that it can handle inlining *removing* a libcall entirely.
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;
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; Finally, we include some recursive patterns and forced analysis invaliadtion
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; that can trigger infinite CGSCC refinement if not handled correctly.
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;
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; RUN: opt -passes='cgscc(inline,function(instcombine,invalidate<all>))' -S < %s | FileCheck %s
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define i8* @wibble(i8* %arg1, i8* %arg2) {
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; CHECK-LABEL: define i8* @wibble(
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bb:
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%tmp = alloca [1024 x i8], align 16
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%tmp2 = getelementptr inbounds [1024 x i8], [1024 x i8]* %tmp, i64 0, i64 0
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %tmp2, i8* %arg1, i64 1024, i32 0, i1 false)
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; CHECK: call void @llvm.memcpy
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%tmp3 = call i64 @llvm.objectsize.i64.p0i8(i8* %tmp2, i1 false, i1 true)
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%tmp4 = call i8* @__strncpy_chk(i8* %arg2, i8* %tmp2, i64 1023, i64 %tmp3)
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; CHECK-NOT: call
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; CHECK: call i8* @strncpy(i8* %arg2, i8* nonnull %tmp2, i64 1023)
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; CHECK-NOT: call
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ret i8* %tmp4
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; CHECK: ret
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}
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define i8* @strncpy(i8* %arg1, i8* %arg2, i64 %size) noinline {
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bb:
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%result = call i8* @my_special_strncpy(i8* %arg1, i8* %arg2, i64 %size)
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ret i8* %result
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}
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declare i8* @my_special_strncpy(i8* %arg1, i8* %arg2, i64 %size)
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declare i64 @llvm.objectsize.i64.p0i8(i8*, i1, i1)
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declare i8* @__strncpy_chk(i8*, i8*, i64, i64)
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i32, i1)
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; Check that even when we completely remove a libcall we don't get the call
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; graph wrong once we handle libcalls in the call graph specially to address
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; the above case.
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define i32 @hoge(i32* %arg1) {
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; CHECK-LABEL: define i32 @hoge(
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bb:
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%tmp41 = load i32*, i32** null
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%tmp6 = load i32, i32* %arg1
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%tmp7 = call i32 @ntohl(i32 %tmp6)
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; CHECK-NOT: call i32 @ntohl
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ret i32 %tmp7
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; CHECK: ret i32
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}
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; Even though this function is not used, it should be retained as it may be
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; used when doing further libcall transformations.
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define internal i32 @ntohl(i32 %x) {
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; CHECK-LABEL: define internal i32 @ntohl(
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entry:
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%and2 = lshr i32 %x, 8
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%shr = and i32 %and2, 65280
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ret i32 %shr
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}
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define i64 @write(i32 %i, i8* %p, i64 %j) {
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entry:
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%val = call i64 @write_wrapper(i32 %i, i8* %p, i64 %j) noinline
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ret i64 %val
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}
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define i64 @write_wrapper(i32 %i, i8* %p, i64 %j) {
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entry:
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%val = call i64 @write(i32 %i, i8* %p, i64 %j) noinline
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ret i64 %val
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}
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