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- ; RUN: opt -S < %s -jump-threading | FileCheck %s
- ; Keep block addresses alive.
- @addresses = constant [4 x i8*] [
- i8* blockaddress(@test1, %L1), i8* blockaddress(@test1, %L2),
- i8* blockaddress(@test2, %L1), i8* blockaddress(@test2, %L2)
- ]
- declare void @bar()
- declare void @baz()
- ; Check basic jump threading for indirectbr instructions.
- ; CHECK: void @test1
- ; CHECK: br i1 %tobool, label %L1, label %indirectgoto
- ; CHECK-NOT: if.else:
- ; CHECK: L1:
- ; CHECK: indirectbr i8* %address, [label %L1, label %L2]
- define void @test1(i32 %i, i8* %address) nounwind {
- entry:
- %rem = srem i32 %i, 2
- %tobool = icmp ne i32 %rem, 0
- br i1 %tobool, label %indirectgoto, label %if.else
- if.else: ; preds = %entry
- br label %indirectgoto
- L1: ; preds = %indirectgoto
- call void @bar()
- ret void
- L2: ; preds = %indirectgoto
- call void @baz()
- ret void
- indirectgoto: ; preds = %if.else, %entry
- %indirect.goto.dest = phi i8* [ %address, %if.else ], [ blockaddress(@test1, %L1), %entry ]
- indirectbr i8* %indirect.goto.dest, [label %L1, label %L2]
- }
- ; Check constant folding of indirectbr
- ; CHECK: void @test2
- ; CHECK: entry:
- ; CHECK-NEXT: br label %L1
- ; CHECK: L1:
- ; CHECK-NEXT: call void @bar
- ; CHECK-NEXT: ret void
- define void @test2() nounwind {
- entry:
- indirectbr i8* blockaddress(@test2, %L1), [label %L1, label %L2]
- L1: ; preds = %indirectgoto
- call void @bar()
- ret void
- L2: ; preds = %indirectgoto
- call void @baz()
- ret void
- }
- ; PR4151
- ; Don't merge address-taken blocks.
- @.str = private unnamed_addr constant [4 x i8] c"%p\0A\00"
- ; CHECK-LABEL: @test3(
- ; CHECK: __here:
- ; CHECK: blockaddress(@test3, %__here)
- ; CHECK: __here1:
- ; CHECK: blockaddress(@test3, %__here1)
- ; CHECK: __here3:
- ; CHECK: blockaddress(@test3, %__here3)
- define void @test3() nounwind ssp noredzone {
- entry:
- br label %__here
- __here: ; preds = %entry
- %call = call i32 (...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i64 ptrtoint (i8* blockaddress(@test3, %__here) to i64)) nounwind noredzone
- br label %__here1
- __here1: ; preds = %__here
- %call2 = call i32 (...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i64 ptrtoint (i8* blockaddress(@test3, %__here1) to i64)) nounwind noredzone
- br label %__here3
- __here3: ; preds = %__here1
- %call4 = call i32 (...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i64 ptrtoint (i8* blockaddress(@test3, %__here3) to i64)) nounwind noredzone
- ret void
- }
- declare i32 @printf(...) noredzone
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