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They are currently implicit because TargetMachine::shouldAssumeDSOLocal implies dso_local. For such function declarations, clang -fno-pic emits the dso_local specifier. Adding explicit dso_local makes these tests align with the clang behavior and helps implementing an option to use GOT indirection when taking the address of a function symbol in -fno-pic (to avoid a canonical PLT entry (SHN_UNDEF with non-zero st_value)).
191 lines
5.4 KiB
LLVM
191 lines
5.4 KiB
LLVM
; RUN: llc -mtriple=x86_64-linux < %s | FileCheck %s
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; RUN: opt -codegenprepare -S -mtriple=x86_64-linux < %s | FileCheck %s --check-prefix OPT
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; The exit block containing extractvalue can be duplicated into the BB
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; containing call. And later tail call can be generated.
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; CHECK-LABEL: test1:
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; CHECK: jmp bar # TAILCALL
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; CHECK: jmp foo # TAILCALL
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; OPT-LABEL: test1
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; OPT: if.then.i:
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; OPT-NEXT: tail call { i8*, i64 } @bar
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; OPT-NEXT: extractvalue
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; OPT-NEXT: bitcast
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; OPT-NEXT: ret
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;
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; OPT: if.end.i:
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; OPT-NEXT: tail call { i8*, i64 } @foo
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; OPT-NEXT: extractvalue
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; OPT-NEXT: bitcast
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; OPT-NEXT: ret
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define i64* @test1(i64 %size) {
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entry:
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%cmp.i.i = icmp ugt i64 %size, 16384
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%add.i.i = add i64 %size, 7
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%div.i.i = lshr i64 %add.i.i, 3
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%phitmp.i.i = trunc i64 %div.i.i to i32
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%cmp1.i = icmp eq i32 %phitmp.i.i, 0
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%cmp.i = or i1 %cmp.i.i, %cmp1.i
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br i1 %cmp.i, label %if.end.i, label %if.then.i
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if.then.i: ; preds = %entry
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%call1.i = tail call { i8*, i64 } @bar(i64 %size)
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br label %exit
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if.end.i: ; preds = %entry
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%call2.i = tail call { i8*, i64 } @foo(i64 %size)
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br label %exit
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exit:
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%call1.i.sink = phi { i8*, i64 } [ %call1.i, %if.then.i ], [ %call2.i, %if.end.i ]
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%ev = extractvalue { i8*, i64 } %call1.i.sink, 0
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%result = bitcast i8* %ev to i64*
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ret i64* %result
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}
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; The extractvalue extracts a field with non-zero offset, so the exit block
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; can't be duplicated.
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; CHECK-LABEL: test2:
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; CHECK: callq bar
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; CHECK: callq foo
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; OPT-LABEL: test2
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; OPT: if.then.i:
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; OPT-NEXT: tail call { i8*, i64 } @bar
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; OPT-NEXT: br label %exit
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;
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; OPT: if.end.i:
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; OPT-NEXT: tail call { i8*, i64 } @foo
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; OPT-NEXT: br label %exit
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;
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; OPT: exit:
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; OPT-NEXT: phi
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; OPT-NEXT: extractvalue
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; OPT-NEXT: ret
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define i64 @test2(i64 %size) {
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entry:
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%cmp.i.i = icmp ugt i64 %size, 16384
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%add.i.i = add i64 %size, 7
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%div.i.i = lshr i64 %add.i.i, 3
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%phitmp.i.i = trunc i64 %div.i.i to i32
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%cmp1.i = icmp eq i32 %phitmp.i.i, 0
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%cmp.i = or i1 %cmp.i.i, %cmp1.i
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br i1 %cmp.i, label %if.end.i, label %if.then.i
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if.then.i: ; preds = %entry
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%call1.i = tail call { i8*, i64 } @bar(i64 %size)
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br label %exit
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if.end.i: ; preds = %entry
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%call2.i = tail call { i8*, i64 } @foo(i64 %size)
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br label %exit
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exit:
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%call1.i.sink = phi { i8*, i64 } [ %call1.i, %if.then.i ], [ %call2.i, %if.end.i ]
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%ev = extractvalue { i8*, i64 } %call1.i.sink, 1
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ret i64 %ev
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}
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; The extractvalue accesses a nest struct type, the extracted field has zero
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; offset, so the exit block can still be duplicated, and tail call generated.
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; CHECK-LABEL: test3:
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; CHECK: jmp baz # TAILCALL
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; CHECK: jmp qux # TAILCALL
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; OPT-LABEL: test3
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; OPT: if.then.i:
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; OPT-NEXT: tail call { { i8*, i64 }, i64 } @baz
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; OPT-NEXT: extractvalue
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; OPT-NEXT: bitcast
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; OPT-NEXT: ret
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;
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; OPT: if.end.i:
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; OPT-NEXT: tail call { { i8*, i64 }, i64 } @qux
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; OPT-NEXT: extractvalue
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; OPT-NEXT: bitcast
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; OPT-NEXT: ret
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define i64* @test3(i64 %size) {
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entry:
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%cmp.i.i = icmp ugt i64 %size, 16384
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%add.i.i = add i64 %size, 7
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%div.i.i = lshr i64 %add.i.i, 3
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%phitmp.i.i = trunc i64 %div.i.i to i32
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%cmp1.i = icmp eq i32 %phitmp.i.i, 0
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%cmp.i = or i1 %cmp.i.i, %cmp1.i
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br i1 %cmp.i, label %if.end.i, label %if.then.i
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if.then.i: ; preds = %entry
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%call1.i = tail call { {i8*, i64}, i64 } @baz(i64 %size)
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br label %exit
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if.end.i: ; preds = %entry
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%call2.i = tail call { {i8*, i64}, i64 } @qux(i64 %size)
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br label %exit
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exit:
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%call1.i.sink = phi { {i8*, i64}, i64 } [ %call1.i, %if.then.i ], [ %call2.i, %if.end.i ]
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%ev = extractvalue { {i8*, i64}, i64 } %call1.i.sink, 0, 0
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%result = bitcast i8* %ev to i64*
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ret i64* %result
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}
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; The extractvalue accesses a nest struct with non-zero offset, so the exit
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; block can't be duplicated.
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; CHECK-LABEL: test4:
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; CHECK: callq baz
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; CHECK: callq qux
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; OPT-LABEL: test4
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; OPT: if.then.i:
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; OPT-NEXT: tail call { { i8*, i64 }, i64 } @baz
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; OPT-NEXT: br label %exit
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;
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; OPT: if.end.i:
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; OPT-NEXT: tail call { { i8*, i64 }, i64 } @qux
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; OPT-NEXT: br label %exit
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;
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; OPT: exit:
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; OPT-NEXT: phi
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; OPT-NEXT: extractvalue
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; OPT-NEXT: ret
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define i64 @test4(i64 %size) {
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entry:
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%cmp.i.i = icmp ugt i64 %size, 16384
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%add.i.i = add i64 %size, 7
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%div.i.i = lshr i64 %add.i.i, 3
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%phitmp.i.i = trunc i64 %div.i.i to i32
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%cmp1.i = icmp eq i32 %phitmp.i.i, 0
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%cmp.i = or i1 %cmp.i.i, %cmp1.i
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br i1 %cmp.i, label %if.end.i, label %if.then.i
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if.then.i: ; preds = %entry
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%call1.i = tail call { {i8*, i64}, i64 } @baz(i64 %size)
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br label %exit
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if.end.i: ; preds = %entry
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%call2.i = tail call { {i8*, i64}, i64 } @qux(i64 %size)
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br label %exit
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exit:
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%call1.i.sink = phi { {i8*, i64}, i64 } [ %call1.i, %if.then.i ], [ %call2.i, %if.end.i ]
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%ev = extractvalue { {i8*, i64}, i64 } %call1.i.sink, 0, 1
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ret i64 %ev
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}
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declare dso_local { i8*, i64 } @foo(i64)
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declare dso_local { i8*, i64 } @bar(i64)
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declare dso_local { {i8*, i64}, i64 } @baz(i64)
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declare dso_local { {i8*, i64}, i64 } @qux(i64)
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