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; RUN: opt -passes=function-attrs -S < %s | FileCheck %s
; This checks for a previously existing iterator wraparound bug in
; FunctionAttrs, and in the process covers corner cases with varargs.
declare void @llvm.va_start(ptr)
declare void @llvm.va_end(ptr)
define void @va_func(ptr readonly %b, ...) readonly nounwind {
; CHECK-LABEL: define void @va_func(ptr nocapture readonly %b, ...)
entry:
%valist = alloca i8
call void @llvm.va_start(ptr %valist)
call void @llvm.va_end(ptr %valist)
%x = call i32 @caller(ptr %b)
ret void
}
define i32 @caller(ptr %x) {
; CHECK-LABEL: define noundef i32 @caller(ptr nocapture readonly %x)
entry:
call void(ptr,...) @va_func(ptr null, i32 0, i32 0, i32 0, ptr %x)
ret i32 42
}
define void @va_func2(ptr readonly %b, ...) {
; CHECK-LABEL: define void @va_func2(ptr nocapture readonly %b, ...)
entry:
%valist = alloca i8
call void @llvm.va_start(ptr %valist)
call void @llvm.va_end(ptr %valist)
%x = call i32 @caller(ptr %b)
ret void
}
define i32 @caller2(ptr %x, ptr %y) {
; CHECK-LABEL: define noundef i32 @caller2(ptr nocapture readonly %x, ptr %y)
entry:
call void(ptr,...) @va_func2(ptr %x, i32 0, i32 0, i32 0, ptr %y)
ret i32 42
}
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