231 lines
7.4 KiB
LLVM
231 lines
7.4 KiB
LLVM
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; RUN: llc -mtriple riscv32-unknown-linux-gnu -o - %s | FileCheck %s
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; RUN: llc -mtriple riscv32-unknown-elf -o - %s | FileCheck %s
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; Perform tail call optimization for global address.
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declare i32 @callee_tail(i32 %i)
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define i32 @caller_tail(i32 %i) nounwind {
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; CHECK-LABEL: caller_tail
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; CHECK: tail callee_tail
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entry:
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%r = tail call i32 @callee_tail(i32 %i)
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ret i32 %r
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}
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; Perform tail call optimization for external symbol.
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@dest = global [2 x i8] zeroinitializer
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i1)
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define void @caller_extern(i8* %src) optsize {
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entry:
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; CHECK: caller_extern
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; CHECK-NOT: call memcpy
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; CHECK: tail memcpy
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tail call void @llvm.memcpy.p0i8.p0i8.i32(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @dest, i32 0, i32 0), i8* %src, i32 7, i1 false)
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ret void
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}
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; Perform tail call optimization for external symbol.
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@dest_pgso = global [2 x i8] zeroinitializer
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define void @caller_extern_pgso(i8* %src) !prof !14 {
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entry:
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; CHECK: caller_extern_pgso
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; CHECK-NOT: call memcpy
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; CHECK: tail memcpy
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tail call void @llvm.memcpy.p0i8.p0i8.i32(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @dest_pgso, i32 0, i32 0), i8* %src, i32 7, i1 false)
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ret void
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}
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; Perform indirect tail call optimization (for function pointer call).
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declare void @callee_indirect1()
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declare void @callee_indirect2()
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define void @caller_indirect_tail(i32 %a) nounwind {
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; CHECK-LABEL: caller_indirect_tail
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; CHECK-NOT: call callee_indirect1
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; CHECK-NOT: call callee_indirect2
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; CHECK-NOT: tail callee_indirect1
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; CHECK-NOT: tail callee_indirect2
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; CHECK: lui a0, %hi(callee_indirect2)
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; CHECK-NEXT: addi a5, a0, %lo(callee_indirect2)
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; CHECK-NEXT: jr a5
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; CHECK: lui a0, %hi(callee_indirect1)
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; CHECK-NEXT: addi a5, a0, %lo(callee_indirect1)
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; CHECK-NEXT: jr a5
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entry:
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%tobool = icmp eq i32 %a, 0
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%callee = select i1 %tobool, void ()* @callee_indirect1, void ()* @callee_indirect2
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tail call void %callee()
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ret void
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}
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; Do not tail call optimize functions with varargs passed by stack.
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declare i32 @callee_varargs(i32, ...)
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define void @caller_varargs(i32 %a, i32 %b) nounwind {
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; CHECK-LABEL: caller_varargs
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; CHECK-NOT: tail callee_varargs
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; CHECK: call callee_varargs
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entry:
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%call = tail call i32 (i32, ...) @callee_varargs(i32 %a, i32 %b, i32 %b, i32 %a, i32 %a, i32 %b, i32 %b, i32 %a, i32 %a)
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ret void
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}
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; Do not tail call optimize if stack is used to pass parameters.
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declare i32 @callee_args(i32 %a, i32 %b, i32 %c, i32 %dd, i32 %e, i32 %ff, i32 %g, i32 %h, i32 %i, i32 %j, i32 %k, i32 %l, i32 %m, i32 %n)
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define i32 @caller_args(i32 %a, i32 %b, i32 %c, i32 %dd, i32 %e, i32 %ff, i32 %g, i32 %h, i32 %i, i32 %j, i32 %k, i32 %l, i32 %m, i32 %n) nounwind {
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; CHECK-LABEL: caller_args
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; CHECK-NOT: tail callee_args
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; CHECK: call callee_args
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entry:
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%r = tail call i32 @callee_args(i32 %a, i32 %b, i32 %c, i32 %dd, i32 %e, i32 %ff, i32 %g, i32 %h, i32 %i, i32 %j, i32 %k, i32 %l, i32 %m, i32 %n)
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ret i32 %r
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}
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; Do not tail call optimize if parameters need to be passed indirectly.
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declare i32 @callee_indirect_args(fp128 %a)
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define void @caller_indirect_args() nounwind {
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; CHECK-LABEL: caller_indirect_args
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; CHECK-NOT: tail callee_indirect_args
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; CHECK: call callee_indirect_args
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entry:
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%call = tail call i32 @callee_indirect_args(fp128 0xL00000000000000003FFF000000000000)
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ret void
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}
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; Externally-defined functions with weak linkage should not be tail-called.
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; The behaviour of branch instructions in this situation (as used for tail
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; calls) is implementation-defined, so we cannot rely on the linker replacing
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; the tail call with a return.
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declare extern_weak void @callee_weak()
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define void @caller_weak() nounwind {
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; CHECK-LABEL: caller_weak
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; CHECK-NOT: tail callee_weak
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; CHECK: call callee_weak
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entry:
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tail call void @callee_weak()
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ret void
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}
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; Exception-handling functions need a special set of instructions to indicate a
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; return to the hardware. Tail-calling another function would probably break
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; this.
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declare void @callee_irq()
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define void @caller_irq() #0 {
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; CHECK-LABEL: caller_irq
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; CHECK-NOT: tail callee_irq
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; CHECK: call callee_irq
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entry:
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tail call void @callee_irq()
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ret void
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}
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attributes #0 = { "interrupt"="machine" }
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; Byval parameters hand the function a pointer directly into the stack area
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; we want to reuse during a tail call. Do not tail call optimize functions with
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; byval parameters.
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declare i32 @callee_byval(i32** byval(i32*) %a)
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define i32 @caller_byval() nounwind {
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; CHECK-LABEL: caller_byval
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; CHECK-NOT: tail callee_byval
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; CHECK: call callee_byval
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entry:
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%a = alloca i32*
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%r = tail call i32 @callee_byval(i32** byval(i32*) %a)
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ret i32 %r
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}
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; Do not tail call optimize if callee uses structret semantics.
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%struct.A = type { i32 }
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@a = global %struct.A zeroinitializer
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declare void @callee_struct(%struct.A* sret(%struct.A) %a)
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define void @caller_nostruct() nounwind {
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; CHECK-LABEL: caller_nostruct
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; CHECK-NOT: tail callee_struct
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; CHECK: call callee_struct
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entry:
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tail call void @callee_struct(%struct.A* sret(%struct.A) @a)
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ret void
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}
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; Do not tail call optimize if caller uses structret semantics.
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declare void @callee_nostruct()
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define void @caller_struct(%struct.A* sret(%struct.A) %a) nounwind {
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; CHECK-LABEL: caller_struct
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; CHECK-NOT: tail callee_nostruct
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; CHECK: call callee_nostruct
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entry:
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tail call void @callee_nostruct()
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ret void
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}
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; Do not tail call optimize if disabled.
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define i32 @disable_tail_calls(i32 %i) nounwind "disable-tail-calls"="true" {
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; CHECK-LABEL: disable_tail_calls:
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; CHECK-NOT: tail callee_nostruct
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; CHECK: call callee_tail
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entry:
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%rv = tail call i32 @callee_tail(i32 %i)
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ret i32 %rv
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}
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; Duplicate returns to enable tail call optimizations.
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declare i32 @test()
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declare i32 @test1()
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declare i32 @test2()
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declare i32 @test3()
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define i32 @duplicate_returns(i32 %a, i32 %b) nounwind {
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; CHECK-LABEL: duplicate_returns:
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; CHECK: tail test2
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; CHECK: tail test
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; CHECK: tail test1
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; CHECK: tail test3
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entry:
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%cmp = icmp eq i32 %a, 0
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br i1 %cmp, label %if.then, label %if.else
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if.then: ; preds = %entry
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%call = tail call i32 @test()
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br label %return
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if.else: ; preds = %entry
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%cmp1 = icmp eq i32 %b, 0
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br i1 %cmp1, label %if.then2, label %if.else4
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if.then2: ; preds = %if.else
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%call3 = tail call i32 @test1()
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br label %return
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if.else4: ; preds = %if.else
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%cmp5 = icmp sgt i32 %a, %b
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br i1 %cmp5, label %if.then6, label %if.else8
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if.then6: ; preds = %if.else4
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%call7 = tail call i32 @test2()
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br label %return
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if.else8: ; preds = %if.else4
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%call9 = tail call i32 @test3()
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br label %return
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return: ; preds = %if.else8, %if.then6, %if.then2, %if.then
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%retval = phi i32 [ %call, %if.then ], [ %call3, %if.then2 ], [ %call7, %if.then6 ], [ %call9, %if.else8 ]
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ret i32 %retval
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}
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!llvm.module.flags = !{!0}
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!0 = !{i32 1, !"ProfileSummary", !1}
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!1 = !{!2, !3, !4, !5, !6, !7, !8, !9}
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!2 = !{!"ProfileFormat", !"InstrProf"}
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!3 = !{!"TotalCount", i64 10000}
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!4 = !{!"MaxCount", i64 10}
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!5 = !{!"MaxInternalCount", i64 1}
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!6 = !{!"MaxFunctionCount", i64 1000}
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!7 = !{!"NumCounts", i64 3}
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!8 = !{!"NumFunctions", i64 3}
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!9 = !{!"DetailedSummary", !10}
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!10 = !{!11, !12, !13}
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!11 = !{i32 10000, i64 100, i32 1}
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!12 = !{i32 999000, i64 100, i32 1}
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!13 = !{i32 999999, i64 1, i32 2}
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!14 = !{!"function_entry_count", i64 0}
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