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eccec47f5c
taken (and used!). This prevents merging the blocks (invalidating
the block addresses) in a case like this:
#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
void foo() {
printf("%p\n", _THIS_IP_);
printf("%p\n", _THIS_IP_);
printf("%p\n", _THIS_IP_);
}
which fixes PR4151.
llvm-svn: 125829
95 lines
2.8 KiB
LLVM
95 lines
2.8 KiB
LLVM
; RUN: opt -S < %s -jump-threading | FileCheck %s
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; Keep block addresses alive.
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@addresses = constant [4 x i8*] [
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i8* blockaddress(@test1, %L1), i8* blockaddress(@test1, %L2),
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i8* blockaddress(@test2, %L1), i8* blockaddress(@test2, %L2)
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]
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declare void @bar()
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declare void @baz()
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; Check basic jump threading for indirectbr instructions.
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; CHECK: void @test1
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; CHECK: br i1 %tobool, label %L1, label %indirectgoto
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; CHECK-NOT: if.else:
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; CHECK: L1:
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; CHECK: indirectbr i8* %address, [label %L1, label %L2]
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define void @test1(i32 %i, i8* %address) nounwind {
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entry:
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%rem = srem i32 %i, 2
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%tobool = icmp ne i32 %rem, 0
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br i1 %tobool, label %indirectgoto, label %if.else
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if.else: ; preds = %entry
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br label %indirectgoto
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L1: ; preds = %indirectgoto
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call void @bar()
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ret void
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L2: ; preds = %indirectgoto
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call void @baz()
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ret void
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indirectgoto: ; preds = %if.else, %entry
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%indirect.goto.dest = phi i8* [ %address, %if.else ], [ blockaddress(@test1, %L1), %entry ]
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indirectbr i8* %indirect.goto.dest, [label %L1, label %L2]
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}
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; Check constant folding of indirectbr
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; CHECK: void @test2
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; CHECK: entry:
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; CHECK-NEXT: br label %L1
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; CHECK: L1:
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; CHECK-NEXT: call void @bar
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; CHECK-NEXT: ret void
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define void @test2() nounwind {
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entry:
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indirectbr i8* blockaddress(@test2, %L1), [label %L1, label %L2]
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L1: ; preds = %indirectgoto
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call void @bar()
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ret void
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L2: ; preds = %indirectgoto
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call void @baz()
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ret void
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}
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; PR4151
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; Don't merge address-taken blocks.
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@.str = private unnamed_addr constant [4 x i8] c"%p\0A\00"
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; CHECK: @test3
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; CHECK: __here:
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; CHECK: blockaddress(@test3, %__here)
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; CHECK: __here1:
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; CHECK: blockaddress(@test3, %__here1)
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; CHECK: __here3:
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; CHECK: blockaddress(@test3, %__here3)
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define void @test3() nounwind ssp noredzone {
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entry:
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br label %__here
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__here: ; preds = %entry
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%call = call i32 (...)* @printf(i8* getelementptr inbounds ([4 x i8]* @.str, i64 0, i64 0), i64 ptrtoint (i8* blockaddress(@test3, %__here) to i64)) nounwind noredzone
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br label %__here1
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__here1: ; preds = %__here
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%call2 = call i32 (...)* @printf(i8* getelementptr inbounds ([4 x i8]* @.str, i64 0, i64 0), i64 ptrtoint (i8* blockaddress(@test3, %__here1) to i64)) nounwind noredzone
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br label %__here3
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__here3: ; preds = %__here1
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%call4 = call i32 (...)* @printf(i8* getelementptr inbounds ([4 x i8]* @.str, i64 0, i64 0), i64 ptrtoint (i8* blockaddress(@test3, %__here3) to i64)) nounwind noredzone
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ret void
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}
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declare i32 @printf(...) noredzone
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