74 lines
2.0 KiB
LLVM
74 lines
2.0 KiB
LLVM
; Inlining in the presence of recursion presents special challenges that we
|
|
; test here.
|
|
;
|
|
; RUN: opt -inline -S < %s | FileCheck %s
|
|
; RUN: opt -passes='cgscc(inline)' -S < %s | FileCheck %s
|
|
|
|
define i32 @large_stack_callee(i32 %param) {
|
|
; CHECK-LABEL: define i32 @large_stack_callee(
|
|
entry:
|
|
%yyy = alloca [100000 x i8]
|
|
%r = bitcast [100000 x i8]* %yyy to i8*
|
|
call void @bar(i8* %r)
|
|
ret i32 4
|
|
}
|
|
|
|
; Test a recursive function which calls another function with a large stack. In
|
|
; addition to not inlining the recursive call, we should also not inline the
|
|
; large stack allocation into a potentially recursive frame.
|
|
define i32 @large_stack_recursive_caller(i32 %param) {
|
|
; CHECK-LABEL: define i32 @large_stack_recursive_caller(
|
|
entry:
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NOT: alloca
|
|
%t = call i32 @foo(i32 %param)
|
|
%cmp = icmp eq i32 %t, -1
|
|
br i1 %cmp, label %exit, label %cont
|
|
|
|
cont:
|
|
%r = call i32 @large_stack_recursive_caller(i32 %t)
|
|
; CHECK: call i32 @large_stack_recursive_caller
|
|
%f = call i32 @large_stack_callee(i32 %r)
|
|
; CHECK: call i32 @large_stack_callee
|
|
br label %exit
|
|
|
|
exit:
|
|
ret i32 4
|
|
}
|
|
|
|
declare void @bar(i8* %in)
|
|
|
|
declare i32 @foo(i32 %param)
|
|
|
|
; Check that when inlining a non-recursive path into a function's own body that
|
|
; we get the re-mapping of instructions correct.
|
|
define i32 @test_recursive_inlining_remapping(i1 %init, i8* %addr) {
|
|
; CHECK-LABEL: define i32 @test_recursive_inlining_remapping(
|
|
bb:
|
|
%n = alloca i32
|
|
br i1 %init, label %store, label %load
|
|
; CHECK-NOT: alloca
|
|
;
|
|
; CHECK: %[[N:.*]] = alloca i32
|
|
; CHECK-NEXT: br i1 %init,
|
|
|
|
store:
|
|
store i32 0, i32* %n
|
|
%cast = bitcast i32* %n to i8*
|
|
%v = call i32 @test_recursive_inlining_remapping(i1 false, i8* %cast)
|
|
ret i32 %v
|
|
; CHECK-NOT: call
|
|
;
|
|
; CHECK: store i32 0, i32* %[[N]]
|
|
; CHECK-NEXT: %[[CAST:.*]] = bitcast i32* %[[N]] to i8*
|
|
; CHECK-NEXT: %[[INLINED_LOAD:.*]] = load i32, i32* %[[N]]
|
|
; CHECK-NEXT: ret i32 %[[INLINED_LOAD]]
|
|
;
|
|
; CHECK-NOT: call
|
|
|
|
load:
|
|
%castback = bitcast i8* %addr to i32*
|
|
%n.load = load i32, i32* %castback
|
|
ret i32 %n.load
|
|
}
|